Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffa2d33633693ea…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 378926ea572ed4fcfa9bf43334d9f6bf SHA-1: 2041db75d1c025053ad5ac78b5f06697678e2309 SHA-256: cffa2d33633693ea94f333e29146470750aa7d17d5a6a1b7b72317de4d2f5f69
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that could be used to disguise malicious intent.

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://maypoin.ru/strik?utm_term=how+to+evaluate+patient+understanding PDF link annotation
    • http://delayikapy.xyz/591006147744imh8.pdfIn PDF document text
    • http://sosed.market/5894455299345z78.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/icrhayD/30213344807.pdfIn PDF document text
    • http://instapriz24.online/la_divina_comedia_resumen_corto_para_niosuasd8.pdfIn PDF document text
    • https://cdn.sqhk.co/xaranoraf/Uhgie04/bojowefuradeve.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/clb6zym/4th_earl_of_sandwich_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifenax/4ihr0Yv/gofebidolugep.pdfIn PDF document text
    • http://jushq.club/monster_vape_embassy_oaksccfjb.pdfIn PDF document text
    • http://easy-money-cash.space/18144899053c32yu.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/ggO9KDK/adjectival_phrase_worksheet_grade_4.pdfIn PDF document text
    • https://cdn.sqhk.co/lunajevon/zhcmhbL/flight_simulator_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/hgnnuhf/90723797368.pdfIn PDF document text
    • http://goldenframecollision.com/how_to_connect_magic_mouse_2_to_ipad_pro_10.5yhwcm.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/gGgYAbR/63180296073.pdfIn PDF document text
    • https://cdn.sqhk.co/dazulegug/gBccDAm/outer_space_drawing_ideas.pdfIn PDF document text
    • http://lifegirls.site/ziwovamozizutijewepodivea4bkk.pdfIn PDF document text
    • http://milanomoda.site/will_mcbride_show_me_downloadn83v6.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/cfb56e1c-2817-4402-92ac-6379c80be9a5/85355347963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a3abdd-49ea-4ea1-b829-c00d6ac3c19c/intellicharger_new_i4_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2074c1e3-5e24-4d0e-be37-5e50cbf39cae/english_speaking_practice_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff5c114-206b-4bd1-afb4-41f4172ccc99/13791206819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f251a032-b4e7-45ec-94da-c6cc36a56786/vifakijevafizerit.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_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 5240 bytes
SHA-256: 5572440beb7d678cd8901861e62616850276dc03ff6da8406f7263b2cc1ef9e7
font_01_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 11180 bytes
SHA-256: 222ec8f96fd949f169e24bfc584a9bb29be27fc9a7ac11ccd2b5ddd03877bd25

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