Malicious PDF — malware analysis report

Static analysis result for SHA-256 355caaa67e4d0517…

MALICIOUS

PDF

62.7 KB Created: 2021-02-26 20:00:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 616c306d4663f212d2cb6891e7c105ba SHA-1: 300c07b4467be78067a93415290525e4c2075f76 SHA-256: 355caaa67e4d05170bfab682a34095b988da2dd5a87a8fe14b2a3ff170a72980
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9753

Heuristics 4

  • 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
  • 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/award?keyword=ec8452+electronic+circuits+2+notes+pdf PDF link annotation
    • http://misstourist.info/98852928524cet4c.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/54551411816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_6029914273e76.pdfIn PDF document text
    • http://tokio-2020.fun/28945365838465om.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370076/normal_5ff81ec5f1f51.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/cvZBTxK/usher_raymond_songs_2020.pdfIn PDF document text
    • http://belkwigs.com/matchless_chieftain_manualw8qm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_601dad094aa7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_602d6cc291deb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500453/normal_602a05b3cd5d1.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/hinSaNW/suxelenobas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5ff579ea83312.pdfIn PDF document text
    • http://startbastar.online/psd_collage_frames_for_photoshop_freep4j3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378836/normal_60080a890549a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_6022bcabb1c42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gupojakami/forklift_safety_quiz_answers_jj_keller.pdfIn PDF document text
    • http://tinijev.epizy.com/good_answers_to_are_you_single.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/difference_between_hurricane_and_tornado_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/37538667970.pdfIn PDF document text
    • http://dubejatusir.epizy.com/diefenbaker_lake_fishing_report.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 5432 bytes
SHA-256: 649390a77697c0c53c194607486618edba381f0a9222df5e273ef65965aa461b

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