Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54bc852d1a4b83a…

MALICIOUS

PDF

122.4 KB Created: 2020-12-07 05:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 88f9c6497c4872ba96053c5a4a972861 SHA-1: 7ce228ab2ebb2219cfddbc5d0c232db292181e40 SHA-256: d54bc852d1a4b83a68f857675a7f9d2526c4656cb09ef5465ed19a7795416c78
176 Risk Score

Malware Insights

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

The PDF contains a callback phishing lure, instructing the user to call a phone number in the context of billing or fraud. The presence of numerous external links, including one to 'trafffe.ru', suggests a link farm or redirection mechanism. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely involving exploitation or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/123?utm_term=unitedhealthcare+mississippi+medicaid+claims+address PDF link annotation
    • https://varavedonenen.weebly.com/uploads/1/3/4/3/134316352/9586271.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/9708270.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5fbe743e4863c.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/862139719099fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5fbc46ef12d3e.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/abdce.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/faf964fcc4f935e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5fb8f6f0bb019.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/falevi/4286175564.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/basara_2_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/trends_in_economic_zoology.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/70311701801.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/fegexotikitaxoteru.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001a7fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A7FB 28256 bytes
SHA-256: db8589672448dd34f6bfdbb425625013d5ae25f1983aaaa7577e1d0966090aa1
font_00_sfnt_off00017042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17042 5304 bytes
SHA-256: d7fb258cc6c7cbc3e0c6873471d8bc8859cd5f855d865397927377050e48b4fd
font_01_sfnt_off00018223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18223 11060 bytes
SHA-256: 121ba7995145fe17e6973ed9e1a2397ec3d1aeab39c3a4b31b05289eaadc3bf9

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