Malicious PDF — malware analysis report

Static analysis result for SHA-256 a159763907a49438…

MALICIOUS

PDF

86.0 KB Created: 2021-03-23 00:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f0b4baedf23df5a1b468d95e3ebe6536 SHA-1: 657fa056e1e16fb665575ba43f0ac3877ba3dfb9 SHA-256: a159763907a4943879d4de6733b4d0337668e4e504df3616bb678a345786f944
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, many of which point to disposable domains and are likely intended to lead users to phishing sites or download further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=porter+cable+16+gauge+nail+gun+not+firing In PDF document text
    • http://jigikujed.scienceontheweb.net/confessions_of_st_augustine_free.pdfIn PDF document text
    • http://shortsomfj.space/starbound_pixel_farming_guidev77du.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/alveolar_sounds.pdfIn PDF document text
    • http://znatural.space/69346302620hhwld.pdfIn PDF document text
    • http://tublitalia.space/relozofimilitivireva717i.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/wiromufezipisukanizfvmgg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490515/normal_6020b8294066c.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/jgbiiji/annelids_online_battle_game.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/engineering_workshop_materials_list.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jhc0iaG/off_road_outlaw_4x4_monster_truck_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_5fe77aea54689.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/58849693721ysu96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_c944664175b447708ddafdb9fec20be6.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_cc265e08b4214f56a68e687d4dcf86e1.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_024bcc17b0354945b4ebfe198fcd6381.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_ed04e4ca02af43b296b4e0d469496087.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/the_lord_of_the_rings_the_motion_picture_trilogy_4k_gift_set.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/2359911890.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_ecd0d5b0f5084f808c487e81857fd06f.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_off00010f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F64 5216 bytes
SHA-256: aa661a7904eed94bc36ce3e59ed12d9c7b3e77a91c74afc371ba996125f6d70b
font_01_sfnt_off0001213f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213F 12124 bytes
SHA-256: 7064d61825d622f9ac7c9a73d00ff6dc22eb1baaf51a2a952f3e8e2d3f2e509b

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