Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a84b7d1c7eac8d5…

MALICIOUS

PDF

75.4 KB Created: 2021-02-25 15:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a824fa1ffc31fb4bc8ee861ab63cd11 SHA-1: d95c1605763bcc008e787fcbdad4d712ec5e4927 SHA-256: 1a84b7d1c7eac8d573181159fb23dba685fa79f28bdb6df7332ac925ef67ea36
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_MFA_LURE' indicates the document likely attempts to harvest multi-factor authentication codes or session tokens, a common tactic in credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://baarspo.ru/wix?keyword=primary+color+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465269/normal_600b48398bd16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448094/normal_6007d92baaa6b.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/xia6Uib/word_ladder_solver_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368956/normal_6028399e85f4c.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/cjaNijq/decode_duo_codenames_duet_online_locale.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/hiO8igV/xuwiparutaveju.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/kxqv2hj/tarot_cards_meaning_the_moon.pdfIn PDF document text
    • https://xozugovapotup.weebly.com/uploads/1/3/1/1/131164024/1452723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416928/normal_5fd69e476b97d.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/86dbafe53007174.pdfIn PDF document text
    • https://wosubazaroden.weebly.com/uploads/1/3/0/8/130813518/8324652.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/qibrjaI/real_pads_become_a_dj_of_drum_pads.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/BBge0gc/smart_tools_pro_apk_2._0._12.pdfIn PDF document text
    • http://golden-bridge.pro/1210221372tjgb1.pdfIn PDF document text
    • https://zejotagidegixop.weebly.com/uploads/1/3/4/5/134522105/sejuzevubox-dowuge-tixikemiz-sujokapanisos.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/niwotipugonuvoz/butterfly_images_drawing.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/vinag.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/dofirukijitorevi.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_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5144 bytes
SHA-256: 894b7c9a898e66017adf25387019ad7025bd29e214b9f84f071aeadab5b5fb74
font_01_sfnt_off0000fc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9E 10704 bytes
SHA-256: 57dbac1e51ff354082f5c625c185b122a6b7152104c588e63af9141a97dc939d

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