Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f932cc12fb3bf76…

MALICIOUS

PDF

81.4 KB Created: 2021-03-28 05:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 450a9543871b975bcfa8df597dad3c3c SHA-1: 419e1b434db05da7aede57a88076f684950d2a62 SHA-256: 3f932cc12fb3bf76c80dc9dde616772c876fb56d87ec839ada7f98909dc207ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=maytag+gemini+double+oven+gas+parts PDF link annotation
    • http://nexofozupugasi.mywebcommunity.org/customer_service_case_study_questions_and_answers.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/social_media_marketing_strategy_example.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/667742413.pdfIn PDF document text
    • http://love-cosmetics.shop/fox_sports_south_directv_now0liks.pdfIn PDF document text
    • http://volelovapudexif.scienceontheweb.net/banting_weekly_meal_plan.pdfIn PDF document text
    • http://pesale.pro/kixulofujofubegofub3a55n.pdfIn PDF document text
    • http://merexazumebenag.medianewsonline.com/pirates_of_caribbean_violin_sheet_music.pdfIn PDF document text
    • http://tortomsk.ru/penilerefjo1m8.pdfIn PDF document text
    • http://vas-rem.ru/numojekarabadavamuwo9dxbp.pdfIn PDF document text
    • http://shoplus.info/86791897123gy5ju.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/26133607935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96abd772-c8fe-4742-ba55-9ca7853ec170/what_belt_does_a_bissell_powerforce_helix_turbo_take.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_e3724a39cdb94c6ab7d13a5d195e1638.pdf?index=trueIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_97af9da2aa2949ed81228f78feea60e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da91bffd-5693-4e1a-87b1-ac1592fc174b/how_to_begin_collecting_art.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/birasu.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/star_trek_2009_trailer_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88483a3-3023-4f58-bafe-0046373e17ce/59928563813.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_eb02c727e2c3452583e5b91e4541b85f.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_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 5584 bytes
SHA-256: 1d6da7b0abce4f3df7712f80f0c0ee72209c3dae44d1dbc84e5cc2589c48af8e
font_01_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 11448 bytes
SHA-256: 8470e8d208d8f3895024a3fbd958565f07433e857886b7bd6fc2f696a0dd896b

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