Malicious PDF — malware analysis report

Static analysis result for SHA-256 772136c636ebff85…

MALICIOUS

PDF

62.2 KB Created: 2021-01-17 16:17:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6cc03a876c7d23a743a4eb606c282551 SHA-1: 52e671d9e4ca6dca3d731ef23a9e50d243fdeef8 SHA-256: 772136c636ebff8598520889c5ef36bcb865373c9e1b0ea21ce0bf03c883440d
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://trafficel.ru/123?utm_term=mcdougal+littell+geometry+chapter+1+test+answers', indicates a lure related to educational materials. No scripts were extracted, but the PDF structure and numerous external links point towards a phishing or malicious content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=mcdougal+littell+geometry+chapter+1+test+answers PDF link annotation
    • https://site-1179301.mozfiles.com/files/1179301/61177454157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fefc2bbab31c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ffac212337db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5fcccbe1681c6.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/3e418a1c6a012f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401971/normal_5ff54e0c08256.pdfIn PDF document text
    • https://kigejowozunafuf.weebly.com/uploads/1/3/4/8/134883406/xuvavobaneg-petimorezusar-puzidosop-ketoritivup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473340/normal_5ff715a9ceecf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5feb0dc0a0a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5fd9f89bd50d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5fefe68051ac0.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/nedijowewoded/nhmrc_clinical_guidelines_for_surveillance_colonoscopy.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD27 2880 bytes
SHA-256: b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167
font_01_sfnt_off0000b765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB765 5736 bytes
SHA-256: 5ccbd05dd29050ba048d64fd56cad0e5fc3e03b7e98a9a3a444f8bc0cb27f1e4
font_02_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 9536 bytes
SHA-256: bc2b0c054ed6495dd3633f6aa8fe80fc0bd1f6d0c6411a44df7090f586c17a6e

Open this report in the interactive analyzer, or submit your own file for analysis.