Malicious PDF — malware analysis report

Static analysis result for SHA-256 77fce84739c4588d…

MALICIOUS

PDF

92.7 KB Created: 2021-01-25 18:10:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2d61cce24497b6a39bb674f9452753cf SHA-1: a3781ce65929c0fc1676de605fd3f67a73a1453a SHA-256: 77fce84739c4588dd03ebf0b4cf8aee46b8e62358c16d51ab292d392bfa1c39a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The presence of external URIs and a link farm on disposable hosting, combined with the 'SE_CALLBACK_LURE' heuristic, strongly suggests a phishing or scam attempt. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content or engage them in a callback scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/aws?utm_term=michigan+warranty+deed+form+pdf PDF link annotation
    • http://potenciy.xyz/700877577840bxdd.pdfIn PDF document text
    • http://my-favshope.online/bademevujonigudukoporunzihk7.pdfIn PDF document text
    • http://study-english-02.space/there_is_one_god_and_one_mediator_nkjvlphq1.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/0geQjf8/mapofawipe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407994/normal_5ff795d26574f.pdfIn PDF document text
    • http://leyloften.online/57819147330rd3gs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448550/normal_5fd813fb9bf06.pdfIn PDF document text
    • http://kernig.online/710316353988klcp.pdfIn PDF document text
    • http://freshnatur.fun/21259531102g1j1a.pdfIn PDF document text
    • http://beach-fruit.fun/forgotten_land_literary4vb2j.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/5368088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403947/normal_5fed14b578c07.pdfIn PDF document text
    • http://todayshop.website/how_to_install_pipes_under_double_kitchen_sink9rb5g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495039/normal_6009353c789ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/68469820956.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 5556 bytes
SHA-256: 461770029d116c77669245a2d59d4f185a740f806a25c4063554130c44b2f9e4
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 11676 bytes
SHA-256: 5bb60d258416e7700fb1da9f85475134d92a90de01cdf492fea23f7669ddfc87
font_02_sfnt_off00015091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15091 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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