Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5372a7adf3a4c4…

MALICIOUS

PDF

88.6 KB Created: 2021-02-24 22:36:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ccace1979290796b9eee7f206bd1c965 SHA-1: 775c222338e6b2157286a30bf5da66d513a05031 SHA-256: ef5372a7adf3a4c41eadb6d6d045d030ee132babce6bf9f4de3ad893587047dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, contains keywords related to classroom technology, likely serving as a lure to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://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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