Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac76e5f2a072dee…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 14:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6eb3580bbda60b0c44344a75af2fd885 SHA-1: 75dc6aa6bbfb030ac27c31d9dc25c811b8b9fdeb SHA-256: aac76e5f2a072deeadfda14a25978f3d7209a89be3f2cc367693d3b053dd74b9
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs strongly suggests the primary goal is to redirect the user to external, untrusted content.

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 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://jottigo.ru/strik?utm_term=audi+s4+avant+2020+australia PDF link annotation
    • https://midejunefe.weebly.com/uploads/1/3/5/4/135400465/pawagunafusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6003bacc72a83.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/jutorivomofeken.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fed38fb3bbb8.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/jcIBib8/new_quizduel.pdfIn PDF document text
    • https://novufetus.weebly.com/uploads/1/3/4/1/134131343/sogasige.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/z4Irigj/zenufupuwapidulupefe.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/Vigie7a/97956004508.pdfIn PDF document text
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/439983.pdfIn PDF document text
    • http://sosed.market/indian_navy_mr_syllabus_in_hindip2or3.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/gfdRJhi/tigemagitewogima.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5feb5cb8d78d3.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/gf3dPji/2173153278.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/301b445b.pdfIn PDF document text
    • http://busivel.xyz/16131015200416e1.pdfIn PDF document text
    • http://tvoyoproc.fun/2006_honda_rancher_es_top_speedar9en.pdfIn PDF document text
    • http://f13x.xyz/10420679030pa5md.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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 5228 bytes
SHA-256: 5e2c37778edc8b16a6324f301960d7138754f00d1381b43e32d70be0786a25ef
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 11300 bytes
SHA-256: 8b56a0ba8a34e5514014b88868a0f5d0eaa207ea699c7bf2588fabb9c7bd53cb

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