Malicious PDF — malware analysis report

Static analysis result for SHA-256 8454a8a1c07c346a…

MALICIOUS

PDF

71.3 KB Created: 2021-03-12 09:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9698fc2ddbdb02ee33ae7cd4c0d8eb74 SHA-1: b7f4e583391172a92fe6248a6379290d29318cc0 SHA-256: 8454a8a1c07c346a31292668b7311c04e8ac6eec488879d9c0f900203787c043
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the presence of numerous external URLs. The document body, though heavily obfuscated, contains text suggesting it is designed to appear as a search result for a PDF-related query, directing users to potentially malicious websites like 'https://golowaki.ru/award?keyword=watermark+pdf+adobe+acrobat+reader+dc'. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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/award?keyword=watermark+pdf+adobe+acrobat+reader+dc
    • https://cdn-cms.f-static.net/uploads/4450512/normal_6034d5cf4a2fb.pdf
    • https://fuwamelewupo.weebly.com/uploads/1/3/4/1/134131589/c19c43dd18eb9b.pdf
    • https://cdn.sqhk.co/kuzaxepigi/fsgeigL/51952148487.pdf
    • https://sasadopebob.weebly.com/uploads/1/3/5/3/135324308/tepoxedokilimikesen.pdf
    • https://mivetemadika.weebly.com/uploads/1/3/4/4/134471856/4dc1bd.pdf
    • http://sewatumafuta.medianewsonline.com/system_performance_brendan_gregg_download.pdf
    • https://cdn.sqhk.co/potonefamuve/ijiiige/6848654986.pdf
    • https://static.s123-cdn-static.com/uploads/4369793/normal_5fc7471469d84.pdf
    • https://cdn.sqhk.co/mumesimasozo/uhcHshc/virus_cleaner-_antivirus_phone_clean_boost_mastercard.pdf
    • https://cdn.sqhk.co/kewixoretuze/aejdhdn/13685673238.pdf
    • https://cdn.sqhk.co/jobasalem/ighaygc/wheel_of_fortune_game_online_game.pdf
    • https://cdn.sqhk.co/tinulafi/hiYjbZ5/linkedin_application_settings.pdf
    • https://bujabofilurukok.weebly.com/uploads/1/3/2/6/132682168/mixef.pdf
    • http://tefitagesev.mypressonline.com/plantronics_m25_battery_replacement.pdf
    • https://cdn.sqhk.co/jadepibake/HPigqii/33865150864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc4e0fe2-d263-4480-b653-9c0760927f4f/samsung_bd-f7500_review.pdf
    • http://roporuti.onlinewebshop.net/how_to_view_photos_on_mac_from_external_hard_drive.pdf
    • https://uploads.strikinglycdn.com/files/4574c8b4-554f-4b82-9ea1-e17a65e8c372/the_end_of_the_world_song_meaning.pdf
    • https://uploads.strikinglycdn.com/files/293bb30b-857e-45e2-8d8b-279ee1e9cbe0/55988798809.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_off0000db26.bin
5ff79d2c5874eb30fc858d90a69da658909eafcd8cc5fafbf8e7127a036bfc68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 5308 bytes
font_01_sfnt_off0000ed2e.bin
eec7c6c6a52abc852e8f942967f842ac3543d7df239bb76348f24a41463a627e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 10196 bytes

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