Malicious PDF — malware analysis report

Static analysis result for SHA-256 78417e7fef0d9deb…

MALICIOUS

PDF

90.3 KB Created: 2021-02-24 22:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2ad131ac6dcebf74098011af09624581 SHA-1: fa0b23a042fc8d6a17d434733acc763aa0043b09 SHA-256: 78417e7fef0d9deb366b5f0e856632b9bb1bb2177112b05b435311885daf4992
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 pointing to disposable domains, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content or download further payloads.

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://jottigo.ru/award?keyword=best+smart+board+for+classroom+in+india PDF link annotation
    • http://lomigakorak.getenjoyment.net/52839965278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_600ba86a54f85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_603256d6da7fd.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/should_i_go_to_disney_world_in_january.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/VljiEjf/craft_palace_pro_2020_apk.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/the_interpreter_of_maladies_setting.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/3375929940.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/14410400442.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/zifabafagi.pdfIn PDF document text
    • http://kaguveka.22web.org/kawosorijat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_5fcf845fc60b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_60359309117c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rosajeku.myartsonline.com/divine_mercy_novena_2020.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/rapibovowoxu.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/modern_day_haggadah.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 5356 bytes
SHA-256: ecaced2335e63400010364284d8002e9ebdbb2c7edb24a1cbd621290ac52cb79
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 10248 bytes
SHA-256: 2060947b94f864add57035824ac0b40f98efe2799fb6183803aa7721fd601d23
font_02_sfnt_off000146ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EF 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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