Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff2c413cd9b46b3d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 03:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0c202e575a40923e1117e14bb6a7df9 SHA-1: 40577ffd0eab5309ba5bed07723863213e06c08c SHA-256: ff2c413cd9b46b3d33de2992fe2440cfc16bb08e7bb743c85c810794a2587360
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of external links, with the primary suspicious URL being https://botokaw.ru/award?keyword=apush+study+guide+pdf. The document body is heavily obfuscated and appears to be generated content, further supporting the link farm or SEO manipulation motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=apush+study+guide+pdf
    • https://cdn.sqhk.co/tedogegez/jbidIJO/space_fighter_2_arcade_machine_for_sale.pdf
    • http://1fps.ru/wuneruxe16e42.pdf
    • https://cdn.sqhk.co/tijinujul/ghn9oaM/lazenoro.pdf
    • https://cdn.sqhk.co/rukugewul/iihQohf/gobela.pdf
    • http://aviabileti.ru/emperor_palpatine_meme_templatelppdk.pdf
    • https://cdn.sqhk.co/zofonabiz/7REiFif/real_car_simulator_game_pc.pdf
    • http://boothattendant.com/lajosawogiz7n.pdf
    • https://cdn.sqhk.co/fajaleniwa/b4Ku35u/xomijewozawa.pdf
    • http://aycotoro0.xyz/zotani78jja.pdf
    • http://nakidki-alkantara.xyz/jilivodapedi0a6gm.pdf
    • https://cdn.sqhk.co/pufowuvikij/oQdjbE5/camscanner_free_document_scanner_and_ocr.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_f7440029f90640c791ca61d8a7290980.pdf?index=true
    • http://bobofipiki.epizy.com/27306551583.pdf
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_f1aba6833ca24f5e94674617f465fbd3.pdf?index=true
    • http://kurejaj.epizy.com/86332530445.pdf
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_fb13fd5866d84dafa78cec3ecacbcdbb.pdf?index=true
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_1a9cef89d0cd46f89d82920fb3d55230.pdf?index=true
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_ef71e3ac0bcc40028973a78b8f4c73de.pdf?index=true
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_15f01fc433ee4e0c94b11c62c10b0525.pdf?index=true
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_7bfed61b1567457183fafdd8bfed56bd.pdf?index=true
    • http://wifobujaxude.epizy.com/bizof.pdf
    • http://gewipudi.rf.gd/felim.pdf
    • http://lomigibowexalu.epizy.com/rebiwugul.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_off0000f8b7.bin
4b996f93cd7ae4375d1f2933ae36d0fa2fa39ca6217aed3efa03fc30e3a1fc0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 5056 bytes
font_01_sfnt_off000109fc.bin
8b88a7bca666cc6efc96213d937a01a1b426c50062d46f7060452ec22bf806bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 10880 bytes

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