Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa6357cabe3576ef…

MALICIOUS

PDF

77.4 KB Created: 2021-04-30 14:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d1c3fc31247d89e398cfab1570cccfa SHA-1: e25a484e96061e2213f4e8d06341ef82a8e0d5d6 SHA-256: fa6357cabe3576ef0a873f55d5843ca5f951b61f30ffe5ff909cc027251c55fb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The document contains a large number of external links, many of which point to PDF files with numeric slugs, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://resalured.ru/strik?utm_term=actiontec+c2000a+bridge+mode', is likely part of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=actiontec+c2000a+bridge+mode
    • https://cdn.sqhk.co/rudolikube/8Wo9ig9/36731413671.pdf
    • https://duludeda.weebly.com/uploads/1/3/4/7/134754074/kirakilekovata.pdf
    • https://cdn.sqhk.co/ketalidukepi/SijWtzx/monster_truck_videos_not_on_youtube.pdf
    • https://cdn.sqhk.co/xuvisisitinu/sgiifhc/63224720319.pdf
    • https://cdn.sqhk.co/fukonovum/8VLcjff/country_music_radio_near_me.pdf
    • https://mulanazujejuxu.weebly.com/uploads/1/3/4/8/134855463/xujedifojex.pdf
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/sunibaxo_tugokexal_wejibosivasujol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/waduzirader/what_is_the_eligibility_criteria_for_bpsc.pdf
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_0d019bed3c074d1aa5d90c7e3e34f27d.pdf?index=true
    • https://s3.amazonaws.com/vibasujefir/what_is_unique_to_western_australias_postcode.pdf
    • https://s3.amazonaws.com/tugabijenovili/13422323287.pdf
    • https://s3.amazonaws.com/sebunuzu/99961890961.pdf
    • http://muvubavove.epizy.com/nakoluriduvu.pdf
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_6ec9c9c0168d4fabba792aab3522ae25.pdf?index=true
    • http://finemadajurene.epizy.com/czasy_przesze_angielski_cwiczenia.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_off0000f0b5.bin
1ca18e13607b375d64966e20918ed0a4425a8c43709d5de790115ad6205fc1c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 5452 bytes
font_01_sfnt_off00010326.bin
bf89dd9fe6db2feb0f5c1fc3a5d6ab51b6d3fb934429e01745db32a24bb5852a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 11104 bytes