Malicious PDF — malware analysis report

Static analysis result for SHA-256 81496d169f3c8dff…

MALICIOUS

PDF

71.1 KB Created: 2021-04-01 14:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d053ce0c1754c342e6628cfaf232db01 SHA-1: 125a84db864848afabd825e1f67843e62fd35915 SHA-256: 81496d169f3c8dff4f5e443521a14a87f798ed49d90ef792839fb557a72c76e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by a machine learning classifier with high confidence. It contains numerous external links, with one prominent URL pointing to 'resalured.ru' disguised as a repair manual. The presence of many links suggests a link farm or a distribution point for malicious content, likely leveraging a PDF exploit or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/123?utm_term=2008+cadillac+escalade+repair+manual
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/accf469.pdf
    • https://cdn.sqhk.co/roxirali/FghdNFN/world_cup_2018_games_online_penalty_shootout.pdf
    • https://cdn.sqhk.co/lisupixiwe/GhiggaS/tedunanadufitexotu.pdf
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fcb34c46dff3.pdf
    • https://cdn.sqhk.co/zojoguxuban/cxUtyAy/metal_slug_attack_mod_apk_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4501045/normal_60177c61a9f0e.pdf
    • https://static.s123-cdn-static.com/uploads/4478123/normal_5fcc1b931591f.pdf
    • http://todurodadol.iblogger.org/35408904506.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_602c58a6990fc.pdf
    • https://cdn.sqhk.co/soxuxopova/hlyUEgi/a_small_world_cup.pdf
    • https://bezulagoxirupaz.weebly.com/uploads/1/3/5/3/135347250/10901b50f3efc1c.pdf
    • https://cdn.sqhk.co/regavebike/GooxJhh/amazon_prime_music_family_uk.pdf
    • https://moliveje.weebly.com/uploads/1/3/5/3/135323163/kitezuxizijesi.pdf
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5ffa58291e00e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_a7e81ffe59b34b6c8bc7a0a08517c3c1.pdf?index=true
    • https://s3.amazonaws.com/jalasilunaz/gapimufimutozibetoboni.pdf
    • https://s3.amazonaws.com/rerinago/racha_video_songs_telugu_mp4.pdf
    • http://kanisal.epizy.com/europass_cv_template_ita.pdf
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_9919bf20390247468ca5b5e6d5fb37c5.pdf?index=true
    • https://s3.amazonaws.com/mukutud/social_contract_theory_in_the_declaration_of_independence.pdf
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_a20a5745d5084fb3bebe3c5cab2f3720.pdf?index=true
    • https://s3.amazonaws.com/wakuzidi/lamirer.pdf
    • https://s3.amazonaws.com/widuxade/zowunelutudavovox.pdf
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_9051abdb11f1452899d157f78beb7529.pdf?index=true
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_8c82bb3ee4e34b5098611319bb42a740.pdf?index=true
    • 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_off0000d7fe.bin
f604d65afc51ef996a38e06fa29870d404c7b3334d6cdba83da95f5779abc56e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FE 5592 bytes
font_01_sfnt_off0000eae5.bin
eb944af9713ec08c671042a1aef43694d851dc358075b7c860458872723ab560		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 10512 bytes

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