Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc42e121fcb5bd5…

MALICIOUS

PDF

71.1 KB Created: 2021-05-28 15:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ae1a477ab1e4f275ab137d73417755b0 SHA-1: 3a9527694433fc4d0deb4102e4606542e1e0166e SHA-256: 0fc42e121fcb5bd5201ecd6a01983dac57c96e53f0c0f72152981e4f0fffbbb4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with one prominent URL suggesting a lure for 'Game brigandine psx iso'. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded content, though heavily obfuscated, likely serves to redirect users to malicious sites.

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://pelibifir.ru/123?utm_term=game+brigandine+psx+iso PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406482/normal_6060a1d09e241.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/bovodiwumutorisati.pdfIn PDF document text
    • https://wapinabukodinu.weebly.com/uploads/1/3/6/0/136051982/463c514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_60412493ae869.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/7e361b53095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_603dad53779a1.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/rexumejixuwi.pdfIn PDF document text
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/435f08790.pdfIn PDF document text
    • https://loxufezikuwudi.weebly.com/uploads/1/3/4/6/134687227/noduxozuwaxezubo.pdfIn PDF document text
    • https://juponujebiz.weebly.com/uploads/1/3/4/7/134773331/wivadokinijedigen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/40071856-b6f1-422b-a423-72238f8c4196/17910315993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21791e6-bb0e-46a7-a078-1f582087813d/radetogifozusoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c2c5bd8-1837-4a77-bedf-e7dcf0d49a95/low_dose_naltrexone_thyroid_eye_disease.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a060ad3e-0117-4045-9a2f-7542d09a4eec/sql_server_hardening_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b48dcea-1029-4118-81f5-eae3935cb92b/what_does_central_idea_mean_in_language_arts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed7f598-48dd-4d58-88a3-55e442d5a061/how_to_install_hp_photosmart_d110_without_cd.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 5196 bytes
SHA-256: 80b65e20decb513e308cc463203f1a1c1ca645603f1c69a844429f1994f6228c
font_01_sfnt_off0000de4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4C 10200 bytes
SHA-256: 462bb0a1340bb1be87a77ab31826673d0cfbf0943595e3e8d240d14a78612f76
font_02_sfnt_off0001011b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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