Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e8bd51c16f9ca9…

MALICIOUS

PDF

69.5 KB Created: 2021-02-24 07:42:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 900dc75afa5af81a39e716b39ce464d4 SHA-1: 5236de444338c4f08c1e9406e53d0e8288cb8d4f SHA-256: 08e8bd51c16f9ca96d4ec6b8cd073eb760a5c6957da756ac53b2fe700474ae95
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing or trojan variant. Although no scripts were explicitly extracted, the presence of numerous external URIs and the PDF structure itself points towards an attempt to exploit users through redirection, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/123?utm_term=how+to+say+greatly+appreciated PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fe4ee6601b0a.pdfIn PDF document text
    • http://hairsprof.ru/wotaxixosurakugebivobazu709tp.pdfIn PDF document text
    • https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/xedokutojip-zevolakobej-sanivane.pdfIn PDF document text
    • http://verenica.net/nobegowulafotewesakuzufs200j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_60250a2aabc1f.pdfIn PDF document text
    • http://sadovik.me/drive_parents_carzpgwy.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/4803109.pdfIn PDF document text
    • http://radanews.site/7196656033739wm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474985/normal_5fe0e0902e26c.pdfIn PDF document text
    • http://natiral.space/45345665988abhq8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_601643eb78711.pdfIn PDF document text
    • http://klosheff.xyz/biology_books_for_neet_freebyqlz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466376/normal_601e8372cdf11.pdfIn PDF document text
    • http://genokoti.iblogger.org/brothers_karamazov_pevear_volokhonsky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_6016d6ca3a9a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 5396 bytes
SHA-256: 82dd96f8630d9770d91498f0ccf39be5a556a91348e4bd542636a0d4850c93f5
font_01_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 10240 bytes
SHA-256: a6c81dbbf95a32c77fce9f3836dcb803b72404bac2088332ba38cd7a9314b7be

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