Malicious PDF — malware analysis report

Static analysis result for SHA-256 926d0bcf1595ff90…

MALICIOUS

PDF

81.4 KB Created: 2021-03-18 16:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 37148ccc7f995aa93a4915ae036f4c8b SHA-1: 1ae86e2bec576fd40c8617c563979de6ce69b2b0 SHA-256: 926d0bcf1595ff9043ecb44c09421100d1062b02dc4c2e593102b5e9ae64ef46
126 Risk Score

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 embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to English learning, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=belajar+bahasa+inggris+toefl+pdf PDF link annotation
    • https://cdn.sqhk.co/moxibusas/bhbZGii/bekejubifefix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fe53563654de.pdfIn PDF document text
    • http://italysummer.space/crossy_road_game_pcat87f.pdfIn PDF document text
    • http://dajinanumiki.iblogger.org/pojajare.pdfIn PDF document text
    • http://jobware.pro/how_many_test_are_there_for_cdl_permitoz3ot.pdfIn PDF document text
    • http://help-violation.com/89929051226hloxz.pdfIn PDF document text
    • https://cdn.sqhk.co/dafiwexoki/jajjria/tony_from_survivor_wife_and_child.pdfIn PDF document text
    • http://eglo.club/animiz_animation_maker_apkkbnfx.pdfIn PDF document text
    • http://lastasked.com/xakivibebakaxatopipupffbko.pdfIn PDF document text
    • http://nigma24invest.online/property_investment_portfolio_templatet3o4z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486748/normal_5fe400210b911.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_a4f942fec7d045a4a84a306bfb8d512c.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_030820c41ac54c09b69445039bf8d86f.pdf?index=trueIn PDF document text
    • http://zulegaxevo.epizy.com/jigubinedururelogewob.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/auriculotherapy_manual_free.pdfIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_e6c6879cbc224144839b7b05a13696cf.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_c03945ca43274b21beac4a983e07f06c.pdf?index=trueIn PDF document text
    • http://fabomisibis.rf.gd/97635542493.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_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 5568 bytes
SHA-256: b64a49b883d46dfba6de857b5b23f60e30deb1897d800d5574f454ff88ee4e51
font_01_sfnt_off000111b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B8 11532 bytes
SHA-256: 6e42ed558cd834518aeefc54e65def127139670f9da91029c5ff64f7f800e702

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