Malicious PDF — malware analysis report

Static analysis result for SHA-256 933ca385a0ae3a7e…

MALICIOUS

PDF

75.7 KB Created: 2021-03-03 20:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ef0e95c9cd317d9e91d25b5acf62760b SHA-1: d977856e1b3e46636014032e3e4544be5df9aed3 SHA-256: 933ca385a0ae3a7e5361c7d90c9813b20c47e798943cb3ad7e5ca5f676ad35fd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs, such as 'https://bologen.ru/123?utm_term=epson+xp+200+print+without+color+ink', are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=epson+xp+200+print+without+color+ink PDF link annotation
    • https://vunivejo.weebly.com/uploads/1/3/4/2/134266425/5167ae50f.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/0f0c5917d0ec.pdfIn PDF document text
    • https://desokopozo.weebly.com/uploads/1/3/4/4/134473980/pezalof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402938/normal_5ff9d524e28da.pdfIn PDF document text
    • http://blaugrana.ru/kruppel_engel_summary_in_englishraadg.pdfIn PDF document text
    • https://koberowebajufom.weebly.com/uploads/1/3/4/0/134096943/butemixeximan-nejodokalakazor-wekoropexegipo-goresa.pdfIn PDF document text
    • http://uorott.com/25859067715wi6ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_601f703715d08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420586/normal_602e5612b2c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484097/normal_600f452d051f0.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/xebuvuwov/22799370924.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/94269111216.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/sunabod.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/kriya_yoga_center_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/99078680207.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/julok.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/xutomarabudogibe.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_off0000ebd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD3 5264 bytes
SHA-256: 797b8d4cce9e0eac610d14c26bf450f68c929755f65a753f3a3973cfcfb817d0
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 10468 bytes
SHA-256: b8a359228cadd2090589e1b645bd3edbb793e5b523d8c64014b7197b1812be6f

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