Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9aaeafc7487373…

MALICIOUS

PDF

74.4 KB Created: 2021-06-12 12:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 53500011156cb979f238dfaa089e3443 SHA-1: e33ab1667e2f3667d930a9d91f846d3d151f7fc6 SHA-256: 5c9aaeafc748737383214d72302c0a203a8859dbaf2058a5c2c06aa6a94ec4a7
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 numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://medvor.ru/pbw?utm_term=double+digit+addition+and+subtraction+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385217/normal_605144bf4dc53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373527/normal_5ffbe6f331595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6018784dac9d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409609/normal_606bcb32cce46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_60557d7714846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5fd0f4bcd23fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445101/normal_600f76ce524ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_605f63bf99f16.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitijaloj.pbworks.com/w/file/fetch/144603198/toyota_corolla_altis_2002_service_manual.pdfIn PDF document text
    • http://sogotobev.pbworks.com/w/file/fetch/144897117/zuchu_litawachoma_mp3_download.pdfIn PDF document text
    • http://veposasidot.pbworks.com/f/treaty_of_hudaibiya_summary.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144461172/84663241778.pdfIn PDF document text
    • http://kigofot.pbworks.com/w/file/fetch/145098522/fight_club_123movies.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/guzupuruxewuxufawijoke.pdfIn PDF document text
    • http://jadudekif.pbworks.com/f/34633637411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def59b75-5f35-494c-b0de-59413c73a011/35434540045.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144629037/60267268385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/586211f3-c1b3-4e08-9ffd-298eec65b08a/beruwajiwizofosudilivoj.pdfIn PDF document text
    • http://sutodoromar.pbworks.com/f/89914627747.pdfIn PDF document text
    • http://fudejob.pbworks.com/w/file/fetch/144732312/friends_quiz_questions_with_answers.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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 5496 bytes
SHA-256: 02556ac421f58c3e334f3b88a1e24b7903526e95f7bd224d8b1914f7b2f7a11b
font_01_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 11176 bytes
SHA-256: 1f385096de3ce06a26df3476530518cf796183f7f9d68ed5660e4261c7e3755a

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