Malicious PDF — malware analysis report

Static analysis result for SHA-256 d755788f4e70e160…

MALICIOUS

PDF

83.7 KB Created: 2021-04-07 00:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca2b37bff20f198f64f8888b1bd236e3 SHA-1: da62da3acd68bc9dafc084925b710eb00683fcb6 SHA-256: d755788f4e70e1600d71612e10edfac1c3e288dcc247889c62b0a2c8e0a508a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with 'https://zajinet.ru/123?utm_term=car+png+background' and 'http://stixlife.info/what_is_a_shift_in_poetryaijw6.pdf' being prominent examples. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://zajinet.ru/123?utm_term=car+png+background PDF link annotation
    • http://stixlife.info/what_is_a_shift_in_poetryaijw6.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/nunatutevupu_funovu_suxuni.pdfIn PDF document text
    • https://jiwujidevidu.weebly.com/uploads/1/3/0/8/130874067/zuwom.pdfIn PDF document text
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/8dc08.pdfIn PDF document text
    • http://lisolu.org/79492801321ezh2q.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/gfjjVws/pilot_near_me_now.pdfIn PDF document text
    • http://luzesawajipux.iblogger.org/dune_buggy_go_kart_plans.pdfIn PDF document text
    • http://timecodes.net/can_you_sell_food_from_your_home_in_south_carolina38n61.pdfIn PDF document text
    • http://wakekuluma.iblogger.org/kofojof.pdfIn PDF document text
    • https://zimazegikej.weebly.com/uploads/1/3/4/7/134732290/dopob_filim_vofelosasitimot_fibuvatinap.pdfIn PDF document text
    • http://floradoma.net/doxomobifafalilab10eg.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/sojilegejixedudeliwevuh0kd1.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/bPggii1/led_lights_color_changing_strip.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jad6eI5/wasiloramowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_d742bb0fbf164b79b4b7aead93f8e991.pdf?index=trueIn PDF document text
    • http://pajipiruk.rf.gd/mijalijedepaseziri.pdfIn PDF document text
    • http://ribezewipuzez.epizy.com/69229712751.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_7116a6d4e642418bbcc7fc9fd57cc6a2.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_2cf3e3fff55547e5861aa6dc56b030d7.pdf?index=trueIn PDF document text
    • http://vezoxonu.epizy.com/40807513549.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_3a46d8f3ce21460384fa3f1c81eaf200.pdf?index=trueIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_861563d2e6044a759827b85483d04670.pdf?index=trueIn PDF document text
    • http://jofaralufax.rf.gd/52953346999.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_off00010e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1C 5140 bytes
SHA-256: bb99dbee0b57b9201204a64bcab49ab3ff7e697fddff80223296e118ec1ca704
font_01_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 9948 bytes
SHA-256: 7373308f1fbb300616bb77e88ad950f8af703f5c54fed7d7176e96a1876d5274

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