Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27cba469fd7d933…

MALICIOUS

PDF

73.2 KB Created: 2021-01-25 18:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cc9e508ebbd4d24e2bb22e43036152a6 SHA-1: 17926234dab69d8c9ec543b1131dab9c4c36f6f7 SHA-256: f27cba469fd7d933b1e5c044d0846e6a18857267e3b271766d8ee56988024a4b
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://trafffi.ru/123?utm_term=r3150+rca+remote+codes PDF link annotation
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/6654747.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/hhhbijG/57963186876.pdfIn PDF document text
    • http://cherrypimp.online/graphic_design_portfolio_website_exampleseotel.pdfIn PDF document text
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/difane.pdfIn PDF document text
    • https://nodopemewave.weebly.com/uploads/1/3/2/6/132682748/5498037.pdfIn PDF document text
    • https://cdn.sqhk.co/feneradebeza/gfQZQgj/pongo_pygmaeus_taxonomy.pdfIn PDF document text
    • http://cybety.xyz/samsung_secure_folder_alternative_ioscsy5x.pdfIn PDF document text
    • http://nesobaka7.xyz/exploration_craft_survival_downloadmuvwh.pdfIn PDF document text
    • http://tatajosak.22web.org/ancillary_department_reports.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/W5znhnr/lilebipanebibaxamad.pdfIn PDF document text
    • https://bezixaror.weebly.com/uploads/1/3/0/7/130739980/2708a5bb690f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5fef8332090c5.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/popstar_pet_ghost_simulatorjlop4.pdfIn PDF document text
    • http://www.m-i-c.comIn 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_off0000e07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07C 5544 bytes
SHA-256: 7d48fb63f87060d8c6599a9a7a28b64794125ded69b28cd2b3e377285618dfb5
font_01_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10916 bytes
SHA-256: 37353e2b453643feaa220b1438af8af4d67f218d16ab6c44fe875d4ef0961c5b

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