Malicious PDF — malware analysis report

Static analysis result for SHA-256 378c229fc30837fc…

MALICIOUS

PDF

73.0 KB Created: 2021-06-12 09:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce67b1aa9a651bbf0262f49a94d8c49 SHA-1: c39a2045350b1472f2e11db8ebe1f8dd0641709a SHA-256: 378c229fc30837fcb106dddc2ee92bff5ebca77259f35f880dde750b7fc91c67
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a lure for further malicious activity. The document body, though heavily obfuscated, suggests a pretext related to employment contracts, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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
  • 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://catamma.ru/pbw?utm_term=sample+letter+of+not+renewing+contract+to+employee
    • https://static.s123-cdn-static.com/uploads/4459479/normal_5fe1ec363b327.pdf
    • https://cdn-cms.f-static.net/uploads/4485310/normal_605a533143026.pdf
    • https://cdn-cms.f-static.net/uploads/4459469/normal_5fd63f551a844.pdf
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fd850a9b7a02.pdf
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6031f5939045f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luwivaj.pbworks.com/f/munejiminifejiredebilu.pdf
    • http://liwuvedesisu.pbworks.com/w/file/fetch/144831900/gilazodumusodawomivi.pdf
    • http://woxikez.pbworks.com/w/file/fetch/145135158/64954269344.pdf
    • http://degenazi.pbworks.com/f/your_first_year_in_network_marketing.pdf
    • http://luwivaj.pbworks.com/w/file/fetch/144517536/how_much_do_helicopter_pilots_earn_in_south_africa.pdf
    • http://rutarotovez.pbworks.com/f/18083216602.pdf
    • http://mijatonevu.pbworks.com/w/file/fetch/144988824/69488785380.pdf
    • http://kemuxin.pbworks.com/w/file/fetch/144678501/cara_belajar_efektif.pdf
    • http://xuwuziz.pbworks.com/f/51112594393.pdf
    • http://tovovojufa.pbworks.com/f/13914145885.pdf
    • http://kemususi.pbworks.com/f/58814827647.pdf
    • http://fatakalewene.pbworks.com/f/49383933530.pdf
    • http://wuvebag.pbworks.com/w/file/fetch/144612915/how_to_use_outlook_365_effectively.pdf
    • http://mizelabe.pbworks.com/f/mubedujaku.pdf
    • http://fisagibop.pbworks.com/w/file/fetch/145071258/kivetovelikebimitofeju.pdf
    • http://negovijalulu.pbworks.com/w/file/fetch/144418476/what_does_ch_mean_on_lg_air_conditioner.pdf
    • http://gudikijuruf.pbworks.com/f/30910638718.pdf
    • 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_off0000e155.bin
84201c68d47819fd59eb1c90c7bc08d75b689faa8975845a2e050a174acc2a51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE155 5456 bytes
font_01_sfnt_off0000f3ea.bin
56620ada566e3a00903a741a42619b9e66cb99b46e03d3cd1a4bcdba81fb08c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 10008 bytes

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