Malicious PDF — malware analysis report

Static analysis result for SHA-256 2371d692521b2dc2…

MALICIOUS

PDF

82.4 KB Created: 2021-03-21 01:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fc8060d3ca7d27a3a7a8fa37a0fb6f48 SHA-1: 21f9c93cbe50cb6376f7869f0c2c3edcab103c28 SHA-256: 2371d692521b2dc2fb8757ab7c98df74e7b382468407bc50d2aea7e1c0982815
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, indicating a link farm or redirection scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest the document's primary purpose is to drive traffic to these external sites, which likely host malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://golowaki.ru/strik?utm_term=best+horus+heresy+legion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424347/normal_600aedb16e8b8.pdfIn PDF document text
    • http://znatural.space/dawudupedvnyw7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407782/normal_5fdf636b5f03c.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ggjgnRr/45754138936.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/c6hf6Ml/sibes.pdfIn PDF document text
    • http://nncucuucuc.space/how_much_does_it_cost_to_replace_a_headlight_connectorzuiy2.pdfIn PDF document text
    • https://cdn.sqhk.co/rixazezozo/a1xichb/apparaitre_hors_ligne_facebook_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408719/normal_604027bec2e3d.pdfIn PDF document text
    • http://evatopshop.xyz/zig_ziglar_books_amazons9i6c.pdfIn PDF document text
    • https://tusemebi.weebly.com/uploads/1/3/4/3/134316443/gataninuxifebafozoz.pdfIn PDF document text
    • https://genolawibiwiz.weebly.com/uploads/1/3/4/3/134316454/8264596.pdfIn PDF document text
    • http://jusapp.club/what_is_skin_so_soft_used_forrolpw.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/Y0Lgijh/dominate_board_game.pdfIn PDF document text
    • http://raifaisentgo.online/933391041358fcqw.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/ad07f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifakepavax/N6Eibih/pokimibe.pdfIn PDF document text
    • https://cdn.sqhk.co/fasegibuniz/820heTH/otilia_bilionera_song.pdfIn PDF document text
    • https://cdn.sqhk.co/zeritogekuja/0iciaZI/megowanotigosug.pdfIn PDF document text
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/bofubed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_600190cfdd913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5fd88bbdcaa48.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/e674684f-4cc8-44a4-83ff-2af9dac18825/how_to_pair_weight_watchers_bluetooth_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/442ddefa-3dd6-4ed0-ac10-1862ba690df0/best_bookcases_for_home_library.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338a9ec2-0a42-4fd1-af50-2af48eeba327/walt_whitman_poems_i_hear_america_singing.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_off0001026f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026F 4888 bytes
SHA-256: f7b236c571b0a565d56c145ba827b0f03ece53cb4fb05c8159a92eb3d459b766
font_01_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 12412 bytes
SHA-256: e6564b55cbb8cfa78b9d75f559cf9bba243356742ca3fba76527922ec7a44ebd