Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b733a1fb4c3af3…

MALICIOUS

PDF

91.1 KB Created: 2021-03-19 07:39:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad5b2c2186f8d498c33c1e02297c966d SHA-1: 2e67e3ffc4069e2d469043d7b928f6bd91961977 SHA-256: b4b733a1fb4c3af352a2dc0e77527d0404ac9f469498cf6b44e6b97297b236a4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used to redirect users to malicious websites for phishing or malware downloads. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of such links, and the embedded URL points to a suspicious domain. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=the+tortilla+curtain+pdf
    • https://cdn.sqhk.co/pinebiven/f2q0ihD/fuworibopiruzefomed.pdf
    • https://cdn.sqhk.co/terodekijur/cyWEcfD/doxijinijivazobisedi.pdf
    • https://cdn.sqhk.co/nuponoviva/FNhi35K/30859435573.pdf
    • https://cdn.sqhk.co/lixipadiwel/hjyhfnX/timeline_presentation_template_free.pdf
    • https://cdn.sqhk.co/ponatabet/3Ihdogh/walking_dead_season_10_finale_full_episode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zoromexemuzid/turaxotido.pdf
    • https://s3.amazonaws.com/zerepuzuze/pojapefada.pdf
    • https://uploads.strikinglycdn.com/files/2f84a1f0-1252-4ace-8270-bd7838edea20/viduzujewejupumozuzajoxez.pdf
    • https://s3.amazonaws.com/nagev/50086397900.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/turtle_beach_420x_reset.pdf
    • https://s3.amazonaws.com/vajefam/xotutebujufasexinogefube.pdf
    • https://s3.amazonaws.com/feliso/a_little_life_quotes.pdf
    • https://uploads.strikinglycdn.com/files/3b03a192-f919-4d60-a5c4-dd6d0ae6e46f/harvard_business_review_marketing_case_studies_free_download.pdf
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_32af0f8e74c64658b72ef883aa37b091.pdf?index=true
    • https://s3.amazonaws.com/tapexiw/coconut_tree_song_video.pdf
    • https://uploads.strikinglycdn.com/files/8503eefb-77fe-4f42-818f-97b0c952c4fb/41330796640.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_4163d80284474411978d4b2c98d48441.pdf?index=true
    • https://s3.amazonaws.com/jifesu/future_generation_computer_systems_word_template.pdf
    • https://s3.amazonaws.com/lewuli/allopurinol_bula.pdf
    • https://s3.amazonaws.com/foneniz/how_to_clean_trane_ac_filter.pdf
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_65f7f04f69494780b665d79770d87580.pdf?index=true
    • https://s3.amazonaws.com/tawosutosuxi/63000480664.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_off0001271b.bin
b53a9a9858ef8062c760f86e1ddae1631d39cb3a4a0c8f0a98ba28a5860003cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 5016 bytes
font_01_sfnt_off00013823.bin
bc2f0b3432134539f3011e683578a772090cd3be99a59768480e37a769a14bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13823 12164 bytes

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