Malicious PDF — malware analysis report

Static analysis result for SHA-256 8275aea5b6b856d6…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 07:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 217b3522fe1b8744c6206ab88985ed3b SHA-1: ea2dcc3bad97477823687ce1ba32783192917673 SHA-256: 8275aea5b6b856d6f73e93b1aeb2ca7eb6c8c9e8ea20037aff0ea858d2b9f013
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The primary external URI observed is https://xezojetit.ru/wix?keyword=hot+snapchat+filters, which is likely used to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/wix?keyword=hot+snapchat+filters
    • https://cdn-cms.f-static.net/uploads/4452395/normal_606226ed239e3.pdf
    • https://vexixizeled.weebly.com/uploads/1/3/1/3/131384380/221f5.pdf
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/9044765.pdf
    • http://pay-order.info/yahoo_for_laptop_windows_7se3og.pdf
    • http://rajonilelubej.22web.org/gazelamejix.pdf
    • http://alkostore.xyz/pioneer_mosfet_50wx4_aux_not_working9cpu9.pdf
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/tibokojozokeva_nejosanip_sotedutox.pdf
    • http://panixatexoxureb.22web.org/bixelogixunuvode.pdf
    • https://rotugufe.weebly.com/uploads/1/3/5/3/135315725/figefuvejuz.pdf
    • https://cdn-cms.f-static.net/uploads/4461777/normal_6023db320b6b8.pdf
    • https://cdn-cms.f-static.net/uploads/4495058/normal_605bcbf03da1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94b1a6d1-e1fa-454b-8aea-b719f55727f1/diary_of_a_wimpy_kid_movie_rating_canada.pdf
    • https://uploads.strikinglycdn.com/files/ce7de00a-d341-42f3-8c87-2e38d0e96fb4/romeo_and_juliet_act_1_scene_4_explanation.pdf
    • https://uploads.strikinglycdn.com/files/e7f99bb6-8aa0-4720-979f-0ad68543ec4b/94796127246.pdf
    • http://vimitafukufes.rf.gd/8000682692.pdf
    • https://uploads.strikinglycdn.com/files/ef77a4c7-6b49-4e39-b581-a7f53951568e/46258649636.pdf
    • https://uploads.strikinglycdn.com/files/020398f9-8c1c-4f22-adfb-31e307ef18f5/bose_sounddock_series_1_remote_control.pdf
    • https://uploads.strikinglycdn.com/files/e3ebcf2c-1054-45b9-8e5c-3fba5383ea00/38519237457.pdf
    • https://uploads.strikinglycdn.com/files/dacb0e0d-cab6-452a-b61a-d6e0dd697804/how_to_register_network_on_samsung_s7.pdf
    • https://uploads.strikinglycdn.com/files/4b993acf-37e6-403c-aefc-7da7e3ba3c4c/netgear_n300_wnr2000v5_factory_reset.pdf
    • https://uploads.strikinglycdn.com/files/3668da22-51b8-4506-8c48-236e952ff644/hoover_carpet_cleaner_parts_canada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf7.bin
87b34b36fe3a05119a3e8824033678eb69062e980a6f0143fbaa5965d04d40cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 5064 bytes
font_01_sfnt_off0000fc2d.bin
b3aca0aaba3b4a1774900090dab7507cd9f97f0514d983925d86b6abddfbb109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11684 bytes

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