Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11088dd676a5fa5…

MALICIOUS

PDF

169.8 KB Created: 2021-04-06 03:40:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4cf5a59b50ecaaa0744a150360a2473e SHA-1: 0e158e4e4eaceb5a8dab6c83ac9ff450b64e3e9c SHA-256: b11088dd676a5fa59639cb4df35d3d3051dd88933f52c981f54f5eaaffd9305f
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm strategy designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, suggests a lure related to a "rogue trader bestiary pdf", likely intended to entice users to click on the embedded links.

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://zajinet.ru/award?keyword=rogue+trader+bestiary+pdf PDF link annotation
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/wujukulo.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/ghRS8JK/car_driving_games_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/m1ihihd/traffic_rush_hour_in_the_morning.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/ghh6whf/wargame_west_front_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/ibwhhjf/gapamuredisedumevaza.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/sggH7u2/ribejexigotutafowaloreri.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/fOhhSO1/dodixujelut.pdfIn PDF document text
    • http://pakawuwujawo.getenjoyment.net/93244419245.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/download_asmaul_husna_beserta_artinya.pdfIn PDF document text
    • https://wupizesave.weebly.com/uploads/1/3/4/5/134581048/4770f.pdfIn PDF document text
    • http://rumepado.mypressonline.com/89619655989.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/fzcb0ql/muriputadinarutetidor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/micro_vu_inspec_manual.pdfIn PDF document text
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_016ec203f4b4474881205565db18efbf.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/how_can_you_tell_if_you_have_high_functioning_autism.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/how_much_to_pay_for_graphic_design_work.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/wallpaper_for_powerpoint_presentation_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/67213326919.pdfIn PDF document text
    • http://pesetunal.onlinewebshop.net/catia_v5_assembly_design_tutorial.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_69e6e1bfa2f64d2b88ec9834a312f19d.pdf?index=trueIn 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_off000260e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x260E8 5424 bytes
SHA-256: 4b751ef53686ffb0d57245445f71b83d5083fafb60947b6888f800d30f7c5731
font_01_sfnt_off00027374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27374 11072 bytes
SHA-256: 75c703102df4d9a038e4398ef4c0dc7ebcc3a1990c01f906e7cc208951696827

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