Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9e6eadbf1b5582…

MALICIOUS

PDF

80.4 KB Created: 2020-11-26 21:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fc74fdb0ed11a9685e193fcdae39054f SHA-1: 1629bbd26c4faabc40b225dbd928a59d4976269f SHA-256: 3c9e6eadbf1b55824915ba7550d2168e8618855cc81e7b08e58187815dc1d9e4
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 significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, with one prominent URL being https://traffking.ru/123?utm_term=492932+oil+filter. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, classifying it as a phishing or malicious PDF. While no scripts were explicitly extracted, the nature of the link farm and the ML/AV detections point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=492932+oil+filter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366014/normal_5f8d3b4a4095b.pdfIn PDF document text
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/4704273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_5fa496533e473.pdfIn PDF document text
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/90efe50069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5f9734a3cade4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_5f9ce1b2e2f0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf743455-1cc3-46ab-a5b6-ae306c0ec6d7/ribadil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/306326b8-7f52-497a-9c0c-b516ee6b4bef/39642085260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ce74b1-5c50-41b8-b352-aa2bc36a2ed8/yellowstone_guide_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca31f1f3-571e-4416-917f-9d4226a4e799/kavakekexezerepiwiru.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/deranged_2012_korean_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4014dfa0-edc8-4b29-b262-b44bcff44ab3/vasizalobimedizibet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd5dea2-7a9f-4b19-a816-d84c8fd24129/41423236140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f90f7b-0334-41bb-a0b8-2d3424c62540/79067321020.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/centriolos_de_que_estan_formados.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 4820 bytes
SHA-256: d0bf82db4ee619343219a45266648989d802dcaf41e170ed398e66a02089cf61
font_01_sfnt_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 11308 bytes
SHA-256: b0480cc72e86241d315429ed609c15b49116cd308008dd44754115a3df38b633

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