Malicious PDF — malware analysis report

Static analysis result for SHA-256 862da02b8fb2ba27…

MALICIOUS

PDF

64.3 KB Created: 2020-11-24 06:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f00ef26c12a321e2f6a90723484069ce SHA-1: 2e2bb75d85b0d0b84d3b0338e78691e6c2249e76 SHA-256: 862da02b8fb2ba27b0736cee7595282eb078385148a6101d2255a88e28bc7264
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated and point to other PDF files, suggesting a link farm or SEO spamming operation. The primary URL, 'https://traffine.ru/strik?utm_term=bemba+proverbs+and+meanings+pdf', indicates a lure to a specific search term. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_LINK_FARM' and the sheer volume of external links strongly suggest malicious intent, likely to drive traffic to malicious sites or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffine.ru/strik?utm_term=bemba+proverbs+and+meanings+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390383/normal_5fb27ca328785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f94c83e943c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_5fa3f0f6a6f6d.pdfIn PDF document text
    • https://nulumekut.weebly.com/uploads/1/3/4/3/134373747/xakizatuxoz_duwad_jitofewoxowok_wubub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5f8c38d1c3853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_5fa9b765927b6.pdfIn PDF document text
    • https://nugesipepisi.weebly.com/uploads/1/3/4/0/134042061/pafuseg_bubolidorulok_nevafit_roguzerunamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5f998a7fb72c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sojaxub/elite_dangerous_krait_phantom_cockpit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bf4e87-ac78-44b5-bf82-ca780d54625c/26534574203.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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 5284 bytes
SHA-256: 7a31f77710e894f877f72e9a296bfe9818db1f0953ed310d9dc7a7b42e5a86f7
font_01_sfnt_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 10756 bytes
SHA-256: c199ce72152964228892a53f3551cdf01ca850678d37d158b22a4a19f05f0424
font_02_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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