Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ac131a2f3db4e…

MALICIOUS

PDF

75.7 KB Created: 2021-06-06 20:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ddfb1d343c75c7304e4e7852871f1d SHA-1: 6ac8e012aaa13e6f2a54a7eec0eb4ffb7c9d4706 SHA-256: bc4ac131a2f3db4e3f3304300dba2bdd7ee3ed8837ae438a5c1eba5b6a05b698
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1553.005 Security Software Tampering

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The presence of external links, including one to 'infrive.ru', suggests an attempt to redirect the user to malicious content. Furthermore, the heuristic 'SE_SECURITY_BYPASS' indicates the document likely instructs the user to disable security software, a common tactic in phishing and malware delivery. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack involving password-protected archives.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/pbw?utm_term=battlefield+bad+company+2+highly+compressed+2gb
    • https://cdn-cms.f-static.net/uploads/4482215/normal_604ccf24b50d8.pdf
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5fe2734931d49.pdf
    • https://cdn-cms.f-static.net/uploads/4374715/normal_600b6ad5f0dbe.pdf
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fe901f899843.pdf
    • https://cdn-cms.f-static.net/uploads/4484818/normal_6047d4dca97f7.pdf
    • https://cdn-cms.f-static.net/uploads/4489035/normal_60394cb71b286.pdf
    • https://cdn-cms.f-static.net/uploads/4463266/normal_6049cc5de0c55.pdf
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5feddf61e711b.pdf
    • https://cdn-cms.f-static.net/uploads/4382629/normal_602f936b4cab7.pdf
    • https://static.s123-cdn-static.com/uploads/4402963/normal_5ff86ea856e7d.pdf
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/3255672.pdf
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60bc014560e6a.pdf
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fd8e8dfe8cc6.pdf
    • https://static.s123-cdn-static-d.com/uploads/4445119/normal_60afea5709410.pdf
    • https://cdn-cms.f-static.net/uploads/4494648/normal_605d2009d79a0.pdf
    • https://cdn-cms.f-static.net/uploads/4454045/normal_602aa29b9f737.pdf
    • https://pirulavedup.weebly.com/uploads/1/3/1/3/131379447/rumojog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ac2ec2e5-219e-4709-940b-4c9c2f17451b/34514622986.pdf
    • http://vimadutukad.pbworks.com/f/76355252504.pdf
    • http://ziludezubeju.pbworks.com/w/file/fetch/144476226/pulifeda.pdf
    • http://zolunegoli.pbworks.com/w/file/fetch/144501015/sopivavu.pdf
    • https://uploads.strikinglycdn.com/files/0deede19-039b-4423-97e1-9f834251fb7a/mututofefi.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_off0000e5ac.bin
8df856dedb2c08bd7875f2ed5c68a5bf120a67228e75c0bd299a817d2d008b03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 5992 bytes
font_01_sfnt_off0000f9f0.bin
2741a1f6d49e4f6157f333aad55a69b9b9f7b4a640b165c89a0710a87db05deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10952 bytes

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