Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76cb86259bc2840…

MALICIOUS

PDF

90.8 KB Created: 2021-06-10 09:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67e116702c2efe3a606bf184bd872472 SHA-1: f20557cac9ab8fda497ae7958a2c07b4770ec28a SHA-256: f76cb86259bc284029f18e616cfe3917b4c6c5df099dfec0187622acad05a89a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers also flagged it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of many external links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/pbw?utm_term=d%2526d+character+online PDF link annotation
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/gitujulun.pdfIn PDF document text
    • https://sowameneritela.weebly.com/uploads/1/3/0/7/130775755/faroruxisewov_vamibote_gapexax_jukukus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_6050efa74070d.pdfIn PDF document text
    • https://jotabaputeja.weebly.com/uploads/1/3/5/3/135350690/8788593.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/3846569.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/1bac6da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_602f9ab75533e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_606df66e86633.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rukuvekuke.pbworks.com/f/75743017344.pdfIn PDF document text
    • http://deburajuza.pbworks.com/f/is_star_trek_fleet_command_any_good.pdfIn PDF document text
    • http://dejapitud.pbworks.com/f/60618369791.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/unlimited_troops_hack_for_clash_of_clans_android.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144413595/92862161987.pdfIn PDF document text
    • http://masigali.pbworks.com/f/koxejanupomupesolaxeta.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/f/what_is_penal_system_theory_in_nursing.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/depubuvijiweg.pdfIn PDF document text
    • http://sonubugu.pbworks.com/f/jaluzelegazakeda.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/f/9935141609.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 4156 bytes
SHA-256: d9d9eb8b5a67a8494ca5a9593d54773c41ba913a17cb426b52e0a193c0b11448
font_01_sfnt_off00013742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 11532 bytes
SHA-256: 4325f1e5965612fc656dcb2b067a34ec7341e69f4115d273214701be34bcd10e

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