Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2a817e55925cfc…

MALICIOUS

PDF

65.7 KB Created: 2021-03-01 06:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d87685221adf32ab93901ce34b29f662 SHA-1: 1ab2c8332a94fa208e9c25a60bf557b4384a50a3 SHA-256: 7f2a817e55925cfc5b6443790aeed5209d4d830d9d1b8688be4582cbe12fe42d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a service manual. The presence of external URIs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=apc+back-ups+rs+500+service+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379046/normal_6028a5ece3514.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/peter_northouse_leadership_theory_and_practice_8th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_600bff48c6947.pdfIn PDF document text
    • https://cdn.sqhk.co/kukelagalefe/bTm3gho/fabutuzipivonadu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381980/normal_5fcfaf5d95327.pdfIn PDF document text
    • http://genoray.pro/42696785993z56dd.pdfIn PDF document text
    • http://simkosa.website/besutakopiky4s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529893/normal_601b3d978e3c7.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/dorian_gray_chapter_1.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/boruxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414869/normal_5ffd5de1eb0c7.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/icB7hdm/xalolenowupibarozemolis.pdfIn PDF document text
    • http://6gusevshop.space/music_rock_and_roll_mp3i3fqq.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/gjMhijj/bomber_crew_complete_edition_switch_review.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/mgd2Ijf/city_barbeque_near_me_menu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/90085026959.pdfIn PDF document text
    • http://rixuroruwe.myartsonline.com/97768794761.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/braun_series_9_92s_electric_shaver_head_replacement.pdfIn PDF document text
    • http://fikexole.rf.gd/consumer_report_best_cars_2016.pdfIn PDF document text
    • http://falalovoxiwada.epizy.com/tekupiwamovotutanun.pdfIn PDF document text
    • http://lusuzajemofim.rf.gd/lamenuvavax.pdfIn PDF document text
    • http://zivuneko.epizy.com/dabizej.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_off0000c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC561 5628 bytes
SHA-256: 227904f680a97cd800590d3544620456f039fdf128e78c34799e6c132800de29
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 9640 bytes
SHA-256: a0f7f70be54a4f7f50d2281e8ae562a8af6de593e827db8cd1b9fb96f56d75cf

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