Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6338ad174fa40e4…

MALICIOUS

PDF

72.6 KB Created: 2021-02-16 22:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 67a9a58a032150acea1fa2baa4fcf5e1 SHA-1: 35cad8150c1354644424cbfba8a55f998b9a4d3e SHA-256: a6338ad174fa40e46a201fa8ae0c49d8678e13509d3f70ac15500673540d158d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to various domains, many of which are disposable or associated with link farms. Heuristics indicate the PDF is a link farm designed to redirect users to malicious infrastructure, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=closetmaid+selectives+drawer In PDF document text
    • http://organicsss.space/kunalulurinzdax9.pdfIn PDF document text
    • https://tubufuximenijo.weebly.com/uploads/1/3/5/3/135304690/nuzetakumiwebebiwe.pdfIn PDF document text
    • http://noksipals.online/46142377462qdrc1.pdfIn PDF document text
    • http://raisinshq.club/dinovekivegafibojxsdfx.pdfIn PDF document text
    • http://usacarins.com/xidebixokedapuwerafitixmx4yi.pdfIn PDF document text
    • http://jushq.club/roneratubivepemirerepamn7a.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/lolus-lowidikisekegex.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/1acca22b64810e.pdfIn PDF document text
    • https://xavapijiwo.weebly.com/uploads/1/3/3/9/133997403/6148865.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/c0962bb152.pdfIn PDF document text
    • http://appletopshop.ru/sonar_bangla_bengali_font_software_freefisld.pdfIn PDF document text
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/eae6d79a8.pdfIn PDF document text
    • https://gakikodokuni.weebly.com/uploads/1/3/1/8/131857060/776a341527b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_6019b7673e193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fe013d2e2ca4.pdfIn PDF document text
    • http://hookup154.online/spray_color_filler_for_hairpme1a.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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 5144 bytes
SHA-256: 80962d259885131a8e71d7e6fe035b0fdfcc54d38ed4d9c9049d3b92130187b8
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 10692 bytes
SHA-256: a13723ad371f4942c4d0712401cd54e5185a45242ca166aa3b02b701c2f3f9ac

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