Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a9606c3f66b2bf…

MALICIOUS

PDF

71.8 KB Created: 2021-02-18 04:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e2f20c691f2d9d46ffe3339d63bf4268 SHA-1: 33bb75e4912ab8f7c4824e62bccf1b2c0a601f87 SHA-256: b5a9606c3f66b2bf3df6ac3b9bd5bd89bf5f7228f676d0b5c9fe14294b324eeb
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 external URIs, with a high concentration on disposable hosting, suggesting a link farm or redirection mechanism. The document body, though heavily garbled, contains text that appears to be a lure related to a history book, which is then associated with a URL containing a 'utm_term' parameter, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/aws?utm_term=libro+de+historia+de+quinto+grado+p%25C3%25A1gina+162+y+163 PDF link annotation
    • http://blubadgehelp.net/417253207102pp1n.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/18809858342.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/dicgcMY/wezuvesipopotomadugukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/kIgijfY/fidinidu.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/gbhihgV/megan_fox_and_machine_gun_kelly_age_gap.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/jfBK76g/13628218095.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/Fggldhb/66170465079.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/life_cycle_cost_analysis_handbooktykfl.pdfIn PDF document text
    • http://zimarul.iblogger.org/e_commerce_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotaduwifomol.rf.gd/chaconne_cello_sheet_music.pdfIn PDF document text
    • http://fapugiv.rf.gd/drama_china_love_020_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/72384511696.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/matrices_word_problems_worksheet_with_answers.pdfIn PDF document text
    • http://fakuzilezozo.epizy.com/luvetanolutel.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/transformers_botbots_series_3_names.pdfIn PDF document text
    • http://gizogebinide.rf.gd/98805566129.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/jaina_build_guide_hots.pdfIn PDF document text
    • http://matemot.epizy.com/adblock_browser_windows.pdfIn PDF document text
    • http://puferug.rf.gd/10157037829.pdfIn PDF document text
    • http://pavefobigemaxe.rf.gd/china_eyewitness_travel_guides.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 6232 bytes
SHA-256: 79a7200fab6f3bd3ec541e9567d5851124eeca3dc3a465558523a766a5aeb67c
font_01_sfnt_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 11360 bytes
SHA-256: ecb5fc13e37cb3f8e34a36f65feee0d9668cb103c1da31eb7fc13e2de80e7468

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