Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d2e8f4839faeea…

MALICIOUS

PDF

73.9 KB Created: 2021-02-02 12:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30c3b57b0df81dce88ede43c13109807 SHA-1: 1f492d9509046150999141c7b7058e46f5ea72c0 SHA-256: 19d2e8f4839faeeac14be24666235382335acaaa05347fe80c4dd3a8291efcaa
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL parameter 'utm_term=speech+writing+format+cbse+class+12', indicating a lure to attract users searching for academic content. No scripts were extracted, but the PDF structure and link farm behavior are strong indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/aws?utm_term=speech+writing+format+cbse+class+12 PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/DETDDji/tomukupudiligagokur.pdfIn PDF document text
    • http://nashremont.site/testout_security_pro_exam_answers5aept.pdfIn PDF document text
    • http://digitalcalakk1.xyz/the_odyssey_emily_wilsoniv4w5.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/B7ibCWw/monster_hunter_world_wiki_fatalis.pdfIn PDF document text
    • https://lobusuzagoti.weebly.com/uploads/1/3/4/4/134470260/loxunubivur.pdfIn PDF document text
    • http://italiabeach.space/bofemvdmo9.pdfIn PDF document text
    • https://cdn.sqhk.co/jofijoju/CgijIgc/another_label_eames_bomber.pdfIn PDF document text
    • http://alsamcctv.com/28627395346yy8z0.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/hajeJmA/kalobapiko.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/QMhj2VP/muxakamemopotuzaritesu.pdfIn PDF document text
    • http://fipoziwebetaz.22web.org/wetixaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pupovedifa.rf.gd/badusawikabijazusi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 5948 bytes
SHA-256: dbaeafa95c40ad5753b4a998b140d4424dd4f85b54bfa33c8e8b115990998b87
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 10092 bytes
SHA-256: 336c56af84dc9d063644f75d4faa90aff90e59ade11ffb865a7478d09414d458

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