Malicious PDF — malware analysis report

Static analysis result for SHA-256 6039a264b8048cf0…

MALICIOUS

PDF

74.4 KB Created: 2021-02-27 11:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7f60bc9c49077787e584c88376740e2c SHA-1: ae0b2191605139f69bdb5a35d64e03235b586e8f SHA-256: 6039a264b8048cf03344f65d2b65249ecd2d56aea6f44a1d2d91242b4dbd991a
186 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 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://pelibifir.ru/strik?utm_term=thule+bike+rack+hitch+removal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384647/normal_600921971ff81.pdfIn PDF document text
    • https://funiduned.weebly.com/uploads/1/3/4/7/134773133/c51cd5d8.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/d7a0ca1ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_602cdc5197a20.pdfIn PDF document text
    • https://kamabaxi.weebly.com/uploads/1/3/4/6/134650964/70bc8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446789/normal_6014ff34b1d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_6034cfd7330cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_5fdb2e37960ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401696/normal_5ffcabf64b799.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://butazajoru.rf.gd/arjuna_arjuna_video_songs.pdfIn PDF document text
    • http://fegujepopofesa.epizy.com/76336605720.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/nimeze.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/tutorial_photoshop_cs3_lengkap.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_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 5072 bytes
SHA-256: ffa18aca9528aaf2d9b88ff6c8c005f8b2cb7121ef16db89903e5d29589221d3
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 10316 bytes
SHA-256: abee5ee9b711a2cd03f92b17fd1c6aaf5805f773fe3816528013bb2eb79bcf6b

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