Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cb7f4f0eae56fa…

MALICIOUS

PDF

73.2 KB Created: 2020-12-21 03:45:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f3ace54a75cd202270e1e42b97ad85bd SHA-1: 95fb72208efd73577cdf8f37393f7a0f79957c59 SHA-256: e0cb7f4f0eae56fa48db25b00e438fa9f1b7f43992ad77c1346928c0e8c54b01
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 numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'trafftec.ru', which is flagged as suspicious. While no scripts were directly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to potentially malicious content or for SEO manipulation. The ClamAV detection further supports its malicious nature.

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://trafftec.ru/aws?utm_term=cain%2527+s+offering+gather+the+faithful PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fb29114011a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f888cf822121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5f99f5bd97993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f98aafd30789.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5fcd63d20199b.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/voxuxuvamogun.pdfIn PDF document text
    • https://vojumemij.weebly.com/uploads/1/3/4/4/134473557/4302974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_5fd664f6bb8ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_5f99a2f020df4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5fdb6faa03e22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc06b148139af037642cc0d/t/5fc2cd7f2dd96f59184acdf8/1606602118763/cheltenham_high_school_sports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ace4f5-5b91-40ed-aab2-aeebbe488006/10542204484.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/simple_astronomy_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff39e154-8ac1-4056-9c9f-eca5078689a8/64302545880.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/45906562525.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 4968 bytes
SHA-256: a48ca83ec0bfcf827934cee249409fec47662101cb9f14a15f70684be6dc63be
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 11236 bytes
SHA-256: b270677cf24a2b7dcbe8ec941232ebf78efee49618fdc95da7bfca166195dacc

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