Malicious PDF — malware analysis report

Static analysis result for SHA-256 538be9e04524ade7…

MALICIOUS

PDF

71.2 KB Created: 2021-02-18 05:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2aa1d653d4d1d23dfb2100952eb0746d SHA-1: 3d0aa570374b76b18f27448f2cf5f67abc52abc0 SHA-256: 538be9e04524ade7da9a97dc79d16f73343f042e5187688a26b65019de62d3fe
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

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://seumenha.ru/aws?utm_term=ti-36x+solar+manual PDF link annotation
    • https://cdn.sqhk.co/dedogupazib/1iiegOx/aliexpress_set_english_language.pdfIn PDF document text
    • https://kazarebowuw.weebly.com/uploads/1/3/5/9/135972211/tusulij.pdfIn PDF document text
    • https://cdn.sqhk.co/nodomepe/3jjTZ28/playstation_5_release_date_uk_pre_order.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/giS5ujb/natewatuzukoxebo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367301/normal_600285db23037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530990/normal_6028391a72c19.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/aihaXhb/gonuwuwovaluferaman.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/KhciefA/ace_combat_7_online_download.pdfIn PDF document text
    • https://dopozigixojak.weebly.com/uploads/1/3/4/5/134509916/27df241a.pdfIn PDF document text
    • https://lideteli.weebly.com/uploads/1/3/0/7/130775407/dozeko-welizirusunugof-fafozulurek-lavegato.pdfIn PDF document text
    • https://wobomiti.weebly.com/uploads/1/3/4/5/134501920/nuzeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418188/normal_601ee870d67e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5fd8a2312af3d.pdfIn PDF document text
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/toxomek_totij_dipusoj.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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 5196 bytes
SHA-256: c9b940cec79f0b2d3c1f1c048c4eaa7226804a3ca30e47a558648b9274973ca9
font_01_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 10908 bytes
SHA-256: 1fd2125a0a15166f50796124ccdc94935129004a8c3c52527c1355995f464e3c

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