Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdfaab8db345ed1…

MALICIOUS

PDF

95.5 KB Created: 2021-04-05 11:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c5259ac47a1add5dc2202ed5c882e94 SHA-1: 48a8c6011a723a0e081330ba0c08a75b296ee7dc SHA-256: 0fdfaab8db345ed19ce4cca571b406a8fd2c3ecaea7873dddaf112627f22c577
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to contain text related to academic subjects, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://midufefew.ru/123?utm_term=misplaced+modifiers+examples+with+answers
    • http://medyayazilimtr.com/game_of_thrones_clash_of_kings_comic_onlinegzsd0.pdf
    • http://sacredname.ru/battlefront_2_online_players_ps4j0n8i.pdf
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/lusoveb.pdf
    • http://lazadacostumercenter.com/exercises_if_clauses_type_1_and_2kvnzz.pdf
    • https://xifutasuwisesa.weebly.com/uploads/1/3/2/3/132302919/9448662.pdf
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/mosutaxavobaris.pdf
    • http://ppl-nutrshopfit.website/33848584914s7qg2.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_6042fac96cf75.pdf
    • http://sberbank.link/36774736008j0vdk.pdf
    • https://cdn-cms.f-static.net/uploads/4417675/normal_6017c32e20d97.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://haifaiv.ru/vodinigijamesugifa1qkdp.pdf
    • https://cdn-cms.f-static.net/uploads/4412895/normal_603808c02e52c.pdf
    • https://rebijigubewu.weebly.com/uploads/1/3/4/7/134770847/d022f144.pdf
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/faxanele.pdf
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/kezufojup_ganejimaji_lifinam.pdf
    • https://cdn-cms.f-static.net/uploads/4372361/normal_6015873e134c4.pdf
    • http://pubggaming.online/troy_bilt_mower_honda_engine_oilkgr21.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_4cda24a8e206414cb3c36f91f3150710.pdf?index=true
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_fce3fa53329043a4b2b65ae5ceb30422.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_ea270926d57c4c8b9470f2091b242874.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013722.bin
fe9d9d9078035cdadb6e6476383fc6dedd5e64408db8aebb024335728e856370		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13722 5560 bytes
font_01_sfnt_off00014a02.bin
3294061111fb5bef582ed0f9bff29b9717e4be650ad3a09f94c243b89913689b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A02 11384 bytes

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