Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdaac2f69ab6b84…

MALICIOUS

PDF

98.2 KB Created: 2020-11-12 20:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3b4995016b40c032e27c5c9a7a0b51b6 SHA-1: 1f68845f93b6a23374d4b684b0dfd0236873a0ed SHA-256: afdaac2f69ab6b847b474fd3f4fc596a4275dd1bfca06d83c4dd17c37477fb70
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://traffine.ru/strik?utm_term=manuel+aza%25C3%25B1a+discurso+de+la+paz+pied', is particularly suspicious and likely leads to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=manuel+aza%25C3%25B1a+discurso+de+la+paz+pied PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456984/normal_5fa6f8a88e9fe.pdfIn PDF document text
    • https://nafusifino.weebly.com/uploads/1/3/4/6/134615437/tezovezojadin-wolan.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/c54726b1.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/703b5c04.pdfIn PDF document text
    • https://wupuvogobed.weebly.com/uploads/1/3/4/5/134507139/3444146.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/3356859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414851/normal_5fa0a2d839c43.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/663ca0c.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/levifad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fa0e500784e4.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/sabegokek/zosufidodofive.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/difference_between_synchronous_and_asynchronous_motor.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_off0001371c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 5136 bytes
SHA-256: 172d7313e7a7b2e7b40afa5b85314b401cc8392b9d4ce1ce40d1e78eb2081794
font_01_sfnt_off0001484f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484F 10952 bytes
SHA-256: fc2d49d55209a7ed7421ddf21948de4f77f3051e06664dbd7a03c53f383dea57
font_02_sfnt_off00016bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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