Malicious PDF — malware analysis report

Static analysis result for SHA-256 b231dfdf96c2efe8…

MALICIOUS

PDF

62.7 KB Created: 2021-03-29 01:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1fedc894c642d0a48b8017134fd1f7b SHA-1: 8798649353d802f52c855594267136838388ad21 SHA-256: b231dfdf96c2efe89857fa3455f217a79994c442423f3c2bd03e402fbc342f97
124 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, including one that appears to be a search result lure for 'Latin bass book pdf free'. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9892

Heuristics 4

  • 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
  • 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://zajinet.ru/award?keyword=latin+bass+book+pdf+free
    • http://oficialshoes.site/replace_shop_vac_motorzw4rq.pdf
    • https://cdn-cms.f-static.net/uploads/4448345/normal_602438eaed157.pdf
    • https://cdn.sqhk.co/saligoliti/jgge10L/find_objects_of_type_unity.pdf
    • https://cdn.sqhk.co/pekobenew/c0m5MDx/vetubibokibumujibeni.pdf
    • https://cdn-cms.f-static.net/uploads/4388407/normal_605f0de58c7a0.pdf
    • https://cdn.sqhk.co/pinofizulag/d7TieD6/kogama_piggy_alpha_chapter_2.pdf
    • https://cdn-cms.f-static.net/uploads/4379221/normal_604c9bf81f8db.pdf
    • http://creditstar-kabinet.com/52132135149lmgu9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ronatiduzoxij/jalijagunupuxu.pdf
    • https://s3.amazonaws.com/ninasivol/92145575592.pdf
    • https://uploads.strikinglycdn.com/files/cfe46fb2-1df7-4829-8c08-2a98a056bee4/how_to_teach_spoken_english_for_beginners.pdf
    • http://zitorosenexof.epizy.com/waxupupelarovonedabotoj.pdf
    • http://jajapelemazibog.rf.gd/48902769138.pdf
    • https://uploads.strikinglycdn.com/files/3ee3efe7-2b01-40d4-b3a2-5f9399a09f95/delonghi_dragon_4_oil_filled_radiator_reviews.pdf
    • https://s3.amazonaws.com/xoguwavosuje/nipifavuwuletarasujafa.pdf
    • https://uploads.strikinglycdn.com/files/99971573-f7f7-4366-8fcc-933b2c318668/what_are_the_most_popular_operating_systems.pdf
    • http://dekozosex.epizy.com/poluvuziluxosipa.pdf
    • https://uploads.strikinglycdn.com/files/3d377556-7eac-4132-8a02-c0dabb906ac0/98_long_haul_covid_symptoms.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e108.bin
5bda06503c83142675dcf489375d986204c0eee2975efb9b870889bb34ebfff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 5148 bytes

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