Malicious PDF — malware analysis report

Static analysis result for SHA-256 c210d82306a163fb…

MALICIOUS

PDF

74.8 KB Created: 2021-02-16 11:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f91cc1e6df16c3bb2b5636cad544a893 SHA-1: c4d0628f2c77a4d6af2d1fef58b8a376682f361c SHA-256: c210d82306a163fbeaf77c3688c1ec4fe01c283682f6706135c772fe3af90e0e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'maypoin.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely leveraging the 'Spearphishing Attachment' technique.

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://maypoin.ru/strik?utm_term=two+negative+effects+of+volcanoes PDF link annotation
    • http://bigswinner.space/employee_appreciation_awards_templatesdz73r.pdfIn PDF document text
    • https://sinupumu.weebly.com/uploads/1/3/4/8/134893056/adbefcb99fde9.pdfIn PDF document text
    • http://worldhold.online/pulufozutepogapizepdi67w.pdfIn PDF document text
    • http://stat-index-co.com/jutifojalakimaxuxu7exf6.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/fisedigexemisomu.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/zidegowuxe-ditut.pdfIn PDF document text
    • http://instahelpforbusiness.com/50320675024dblur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424376/normal_6000e44008175.pdfIn PDF document text
    • http://8bitbeardsco.com/higher_order_derivatives_worksheet_with_answersamz8k.pdfIn PDF document text
    • http://ukranews.site/dark_souls_2_weapon_scaling_listjyig8.pdfIn PDF document text
    • https://vamawawu.weebly.com/uploads/1/3/0/8/130874524/167c9ca6d2fd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_5ff5e3f33ff34.pdfIn PDF document text
    • http://cheapkeys.site/63683230901h941j.pdfIn PDF document text
    • https://buzixigadojaw.weebly.com/uploads/1/3/5/3/135316262/3426088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505363/normal_60004b67329ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385228/normal_6007fd45e82c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupumimegijema.epizy.com/tuvufevasutetowomudoze.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 5056 bytes
SHA-256: de5e93260358df0ce312b42bc389ef85914ed15322e329c4e0ed42e9f47d4a1e
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10080 bytes
SHA-256: 9db9ac0d734e8ad6f0cb3a06580d20729e7d698f3a3d7f776152a3273c39bcfe

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