Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4b8ce104e78a0f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-24 15:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9046db2fa9a000ef03d5c3661cc8b7d0 SHA-1: dd7bf5730b2c5469ca8813eceb90a8171e37e7ab SHA-256: 7c4b8ce104e78a0fa747b2b75245fd4362a10fdf7a2e3699f9484512115cf13f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that redirects to a domain known for hosting malicious content, disguised as a free manual download. Heuristics indicate this PDF is part of a link farm on disposable hosting, and a machine learning classifier and ClamAV both flagged it as malicious, specifically as a phishing trojan.

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://jumiwimov.ru/wix?keyword=stihl+chainsaw+repair+manual+free+download PDF link annotation
    • http://raftgjgr.space/81060095656m792.pdfIn PDF document text
    • http://dvigatel.guru/camping_merit_badge_requirement_10_answerwlqgp.pdfIn PDF document text
    • http://dawezedelofeda.scienceontheweb.net/bigger_leaner_stronger_mike_matthews.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/591796932830gsbi.pdfIn PDF document text
    • http://nipizakevenuvis.scienceontheweb.net/sozipasorupebibaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/353e0ee7-b4dc-4daf-937a-989813c54c45/toduninijemini.pdfIn PDF document text
    • http://waboruvuvu.epizy.com/quantitative_aptitude_practice_papers.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_cc370b2f07a54aef9776c001ae442911.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/33549759903.pdfIn PDF document text
    • http://wilediza.epizy.com/mathematics_textbook_for_junior_secondary_school.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/24710760630.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_c5635575eb77499f95c44ae0dffde82a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49899f94-6935-43be-bc45-fdda46f6441d/vowezenerofulavalikageji.pdfIn PDF document text
    • http://purezaviwof.myartsonline.com/55502384933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5bd34c0-82ca-4ea6-ad9d-c75c1db4ec2b/5879903540.pdfIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_205ddaa4cc5349d1ac43d68ebb18ac0d.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_f68f50943ce1439088ab84ad864856ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/why_is_my_lorex_security_system_beeping.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_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 5588 bytes
SHA-256: 07e00e428a953596f622d93b97e5d087b2084ea69bfcb3e9141998a4c3e1b99d
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 11412 bytes
SHA-256: c308bc10e49dcd1cc95fb1c79244cff11745a8ea4246c54a4f9b520ee28b32bc

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