Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e81eb9e51bb7dc9…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 07:30:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8745b88691c4c2596aaabf887ea49b4e SHA-1: 741c35a14c6980c90b82bb2c2dd3095420439794 SHA-256: 2e81eb9e51bb7dc9de6a55c544f8023bf64080fe424b553093ce9e6970af16bb
156 Risk Score

Malware Insights

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

The PDF contains a link farm designed to mimic search results, specifically for 'google account manager 6 apk free', directing users to external PDF files. This technique is commonly used in phishing campaigns to distribute malware or lead users to credential harvesting pages. The presence of multiple external links and the ML classifier's high confidence score indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=google+account+manager+6+apk+free
    • https://cdn.sqhk.co/firokizita/iWgfjfN/42212477074.pdf
    • https://static.s123-cdn-static.com/uploads/4416150/normal_5fe47eab7837d.pdf
    • https://cdn-cms.f-static.net/uploads/4488837/normal_603d90c94cad6.pdf
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fd2ec6ebfa35.pdf
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5fda65099a677.pdf
    • https://cdn.sqhk.co/jekunesoru/DANrhdm/89083274621.pdf
    • https://static.s123-cdn-static.com/uploads/4475000/normal_5ff0b648bcd1a.pdf
    • https://cdn-cms.f-static.net/uploads/4369763/normal_6039f8db9e7de.pdf
    • https://cdn.sqhk.co/purizepore/hjijhja/alkahraba_fixed_bill.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6022cae829559.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_604a611b9d287.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_81ea8081cd3b4675ae34436d1e887aa9.pdf?index=true
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_98af866f8b654dc09384d1b78abd0633.pdf?index=true
    • https://s3.amazonaws.com/warapagefasovi/who_rules_america_the_corporate_community_and_the_upper_class_domhoff.pdf
    • https://s3.amazonaws.com/jepinebawo/bwv_1064.pdf
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_19d717c4780e4a0bbcc5e3ad30ec0f2b.pdf?index=true
    • https://s3.amazonaws.com/vetamedisoz/wavemogijenezodo.pdf
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_a8f48f4da8e84b288d3beeefe4a0bcfe.pdf?index=true
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_5ad921c964a74481a66006b23d286587.pdf?index=true
    • https://s3.amazonaws.com/pibabopuduj/kowedaxobozu.pdf
    • https://s3.amazonaws.com/wupixufekijax/islcollective_german_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2f.bin
f1ea2fb03a67573278c4a7fbabcfc992f793b065632633fcd4d9ab068ce34bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 5408 bytes
font_01_sfnt_off0000fe8b.bin
c68589370714ba750a86f94bd443c927c3f68d7e86a1ef6901b402216338cec3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10780 bytes

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