Malicious PDF — malware analysis report

Static analysis result for SHA-256 331a0e1b7b66bb5b…

MALICIOUS

PDF

68.9 KB Created: 2020-11-12 21:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2ac2f6da15fd73e95639722086d6ca1f SHA-1: 904a4c9a4df281b9dd6512fd881d9944c51e38d6 SHA-256: 331a0e1b7b66bb5bef6083931b830458eee996fd6d4d708c2e84dcf68bbe57e8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/123?utm_term=ryobi+10+inch+table+saw+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470389/normal_5fa519aabd8d1.pdfIn PDF document text
    • https://lekinowi.weebly.com/uploads/1/3/4/4/134476644/274915.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/zuses/fineke.pdfIn PDF document text
    • https://s3.amazonaws.com/movodanex/english_labrador_puppies_for_sale_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/subject_verb_agreement_worksheets_11th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/3ds_max_plugins_list.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/cadet_uniform_cato.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/macroeconomics_gregory_mankiw_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/jorgensen_presidential_candidate.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/where_abouts_do_you_live.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/huddersfield_town_t_shirt.pdfIn PDF document text
    • https://s3.amazonaws.com/pezufatexo/logosiguvutari.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/79241186906.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/47197893973.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_off0000cfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE0 5484 bytes
SHA-256: 8062b8c8485be78f77c558474fa8cdec293e2725d2aa5788c4769931622f8e5c
font_01_sfnt_off0000e2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A8 10600 bytes
SHA-256: 75be8b4627a13d5d16f6ee5c2dfcbbefa8f56e78943ab4600fc277e364509091

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