Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfc6b82f5825a9c…

MALICIOUS

PDF

85.4 KB Created: 2021-05-27 18:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8ce43aec0df5da81817a47a66cd1b948 SHA-1: 277920b517a80d1fcbb74a1077038c4748c3544b SHA-256: bbfc6b82f5825a9c71eb30c883ef974a52878e3420036e82fffe9fbebd641802
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The presence of a callback lure heuristic indicates the document likely attempts to trick the user into calling a phone number, a common tactic in tech support scams and phishing operations. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=lg+revere+vn150+manual PDF link annotation
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/3104fb87d8.pdfIn PDF document text
    • https://tifitafi.weebly.com/uploads/1/3/4/3/134390202/618b48a6eee0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_60618fce6ef1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465123/normal_5ffbae74b83fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453336/normal_605239eeccbfd.pdfIn PDF document text
    • https://tasuzifesuxad.weebly.com/uploads/1/3/7/5/137502252/kexej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_604efd917494c.pdfIn PDF document text
    • https://xazatawivofudod.weebly.com/uploads/1/3/4/3/134313500/kizoxekapun_tarobofal_rebasumutal_zifebone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411218/normal_5ff4e322192fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_606c7a9226a71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fff29bcdb84f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_603126b382a13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc94a2704d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_5fd9043944316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5ffda8577060e.pdfIn PDF document text
    • https://nofoxevejumumu.weebly.com/uploads/1/3/1/8/131857054/ranizabowanupubagopi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367961/normal_6006aa020c860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_602f2c363bc6a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e15d79-eb26-4680-a0ee-733eed45c9b5/learn_english_vocabulary_free_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7291d2-2a3d-4451-b718-2e02985f4e9f/50670717376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b541353b-e2fe-4e6f-a32c-3b8bc5bd3696/subtraction_without_borrowing_worksheets_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4afaef-a1d3-44b9-8a65-195d94757f82/sixagotapum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ce630f-4449-40ce-9a06-e8d06b53cd0c/vejejurufonikulofabilud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68944596-9a26-48a2-8ab0-5360e3927344/xewetasavusevukiseme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cb5f0e-f4d7-4fd0-89f5-962157c53eb6/two_step_cluster_analysis_python.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be1f235-75db-49db-b3f6-e4a197e643cd/13524515268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49a78eb-d53d-4557-9978-cd529927fe3d/elements_of_creative_writing_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26eb5e2-1900-416d-be17-8368b67217ae/giviwilusezuk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 5144 bytes
SHA-256: 206e59f8f3586e35c32d683e4c13e3e26ead2b2b6b6df04ab156920392ad8218
font_01_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 12136 bytes
SHA-256: 85f0d591bb6e44913f10df75c72771007d6f27314c67a1f8c6f7a1b8e24ae3ae

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