Malicious PDF — malware analysis report

Static analysis result for SHA-256 07728f71be7da28f…

MALICIOUS

PDF

77.1 KB Created: 2021-04-18 23:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 181f0c1ab89fb5070f6a72f5491e57a7 SHA-1: c3401344318b48aa8a10205b2221b9afe26abf9f SHA-256: 07728f71be7da28faace9e2071eb5c839567cc550339d79dcadee082321891e1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. While no scripts were directly extracted, the nature of the link farm and the ClamAV detection suggest the intent is to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://lozipotod.ru/strik?utm_term=whats+a+simulacra PDF link annotation
    • https://cdn.sqhk.co/besogevipadi/ja1xnEC/download_zombie_street_fighter.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/2yE8StG/31770425546.pdfIn PDF document text
    • https://cdn.sqhk.co/besiwowegin/cnegjii/66797312817.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/gghhk4l/global_smartphone_shipments_by_vendor.pdfIn PDF document text
    • http://amsidgi.xyz/what_is_lean_business_model_canvas0kdx8.pdfIn PDF document text
    • https://cdn.sqhk.co/jogujufuza/SvCgjjj/three_mile_island_camp_lake_winnipesaukee.pdfIn PDF document text
    • http://comp-arenda.site/vw_beetle_repair_manual_freeva38k.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/e0aihha/pickaxe_of_earth_and_song_best_perks.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/UHh9kgg/amaze_meaning_in_oxford_dictionary.pdfIn PDF document text
    • http://semengergel.ru/informatica_powercenter_questions_and_answers27q4f.pdfIn PDF document text
    • http://amandeepsadyora.com/ryobi_bt3000_price_new8368o.pdfIn PDF document text
    • http://formverifiedbadge.com/zapenojenoretimanapurivpezs4.pdfIn PDF document text
    • http://item-mask.top/simbolo_de_fotoceldacfep5.pdfIn PDF document text
    • http://hdvideo.design/we_came_to_believe_definitionr8oxm.pdfIn PDF document text
    • http://realwockyc.info/gazujevevasekitedalufagezx5kb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_b4ed1374d85347ba8b2f91f9ff525c93.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_a98b6fc9a49f481cabb08898d1e59502.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_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 5052 bytes
SHA-256: 1ffa70653517013def61bf358a5b196929b0278f6292de5f4bde249b77cd2db5
font_01_sfnt_off0000ffab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAB 11232 bytes
SHA-256: 32ec511d2ba3979ea5c9576bb932d465b7d68b8e5dfbf001accbaa06b9a45af7

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