Malicious PDF — malware analysis report

Static analysis result for SHA-256 8966020af903f3b9…

MALICIOUS

PDF

89.3 KB Created: 2021-05-03 16:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e046cc5db9ffb42c68d6afc2a8171b98 SHA-1: 743555b3dded2eb9f465c73f92550e476e2a8799 SHA-256: 8966020af903f3b9840dea7ec8f09ebb5cb86bb723ac099637dc050764fc1557
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains a large number of external links, suggesting a link farm or phishing attempt, with a primary suspicious URL pointing to 'jacksth.ru'. The document body, though heavily obfuscated, appears to be a lure related to technical support or device troubleshooting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=how+to+get+sony+receiver+out+of+protect+mode
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fd24753c48e6.pdf
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5fe699dd4c731.pdf
    • https://cdn.sqhk.co/dodirorip/gjhhgh9/broadsheet_best_restaurants_south_melbourne.pdf
    • https://cdn.sqhk.co/turaxulefa/gh7pyhe/angry_birds_pop_blast_apk_download.pdf
    • https://cdn.sqhk.co/xafemepino/mqaVjhh/gifesazuziwizapitinox.pdf
    • https://cdn.sqhk.co/bofagenined/jbgiMnx/red_button_shirt_womens.pdf
    • https://cdn.sqhk.co/futevanu/gdugggh/frag_pro_shooter_tier_list.pdf
    • https://cdn.sqhk.co/fugovigul/aigwBgj/28301371174.pdf
    • https://cdn.sqhk.co/verexoleki/oaia6ia/48529935561.pdf
    • https://cdn-cms.f-static.net/uploads/4418167/normal_606253ecd4946.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/futamo/james_baldwin_essays_book.pdf
    • https://s3.amazonaws.com/kasuwevovog/kolojosogavoretovegom.pdf
    • https://s3.amazonaws.com/topipovikapari/blank_comic_book_templates.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_03198be7e7104b01b3a32e329c87564e.pdf?index=true
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_10af2677410b41b59b69e07f1fdc3320.pdf?index=true
    • https://s3.amazonaws.com/pewibim/7694366728.pdf
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_45cf5ab43a0040ffbda9e29c82ccd1df.pdf?index=true
    • https://s3.amazonaws.com/sulasatevirexo/dance_with_my_father.pdf
    • https://s3.amazonaws.com/robumuduluwise/73713240903.pdf
    • https://s3.amazonaws.com/setikizo/62830907799.pdf
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_dbb0702235f144c99e9bff7738ff5380.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_off000120c8.bin
04ca9c5f336ee08103b1786d8a626caeef60e0c28365c368189eac2f09c27625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C8 5448 bytes
font_01_sfnt_off00013366.bin
eed5c6b434f8da461b1ea54562e425464a6c7d8fc6428dd890bae22d59fa7d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 10712 bytes

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