Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8b844d748e542a…

MALICIOUS

PDF

73.9 KB Created: 2021-04-15 00:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc7756e5273cc88102d638b311434548 SHA-1: 7bf41a458093e466b027b9e8b726880ccce826f7 SHA-256: 6a8b844d748e542a5531303a25e10f4743b651c9aeb4a873c907c2672e48f16c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'permutation exercises with answers'. No scripts were extracted, but the presence of numerous external links indicates a phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/strik?utm_term=permutation+exercises+with+answers
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/rafejopotogugawala.pdf
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/gosizeninofaje.pdf
    • https://cdn.sqhk.co/rotogogoji/haighcm/5_little_jumping_frogs.pdf
    • https://midumusifefo.weebly.com/uploads/1/3/5/4/135401272/4197089.pdf
    • https://sinezotuze.weebly.com/uploads/1/3/0/9/130969777/xipuzezem.pdf
    • https://ramokazadi.weebly.com/uploads/1/3/4/4/134470245/dusofudivaz.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/d9511c5d5251.pdf
    • http://gopusoduj.mygamesonline.org/pokog.pdf
    • https://tataberoxem.weebly.com/uploads/1/3/0/8/130874397/vonununotezisetuna.pdf
    • https://lotijilakoda.weebly.com/uploads/1/3/4/4/134468432/bc151a74.pdf
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/tetogegux.pdf
    • https://cdn.sqhk.co/girewobo/WKlLpbn/awesome_live_wallpapers_pc.pdf
    • http://bajoreto.sportsontheweb.net/electron_configuration.pdf
    • http://pivojowemetobiv.mywebcommunity.org/building_rapport_with_students.pdf
    • https://cdn.sqhk.co/vavefamixivi/hDHPzHg/8395921561.pdf
    • https://cdn.sqhk.co/dederubap/wghji46/100_doors_floors_escape_level_45_solution.pdf
    • https://cdn.sqhk.co/rukefureku/jgU9jdu/texas_longhorns_logo_png.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kotodur/convert_audio_to_midi_logic_pro_x.pdf
    • https://s3.amazonaws.com/pubopelej/virus_vs_bacteria_worksheet_answers.pdf
    • https://s3.amazonaws.com/lopadivupudexa/deped_order_42_s._2016_dlp_template.pdf
    • https://s3.amazonaws.com/kosipefojaw/76590402353.pdf
    • https://s3.amazonaws.com/zaxawetawupo/safe_church_policy_baptist.pdf
    • http://varirojemixu.myartsonline.com/attestation_sur_l_honneur_de_concubinage.pdf
    • https://s3.amazonaws.com/lekizopiloref/kumujajamiluvuzu.pdf
    • https://s3.amazonaws.com/rujabepifar/sony_camera_rx100_ii_manual.pdf
    • https://s3.amazonaws.com/zatasipezeg/85392662609.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_off0000e340.bin
62d4ace42f3d20f746bb69738d42c0836bf09df0e8fedd6a87d84dcaa2029723		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 5168 bytes
font_01_sfnt_off0000f4b7.bin
b2ce369007c3e635240edf3bc6b7e04dd1df313d2ad3221194706cf5f674cd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 10444 bytes

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