Malicious PDF — malware analysis report

Static analysis result for SHA-256 deeb83c2c35de809…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 08:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72df9e4346b5bf8a33ba180695c0b3a2 SHA-1: e236620191172fa64a791bfc31a3a3f19ee43476 SHA-256: deeb83c2c35de809d914e6ae9e895cc06d6258ea4b7ec8fa41d45e6577195992
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains associated with link farms or potential phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lozipotod.ru/aws?utm_term=why+won%2527t+my+front+load+washing+machine+drain
    • https://cdn.sqhk.co/dopenemef/ihbhbCR/atom_structure.pdf
    • https://cdn.sqhk.co/kevapaboxer/ehajdWH/14623389981.pdf
    • https://cdn.sqhk.co/fugovigul/ie329cy/46469111566.pdf
    • http://fofumumitem.medianewsonline.com/54711448294.pdf
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/09af99.pdf
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/zixejanawob.pdf
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/a4711.pdf
    • https://cdn.sqhk.co/vikaxokaso/ghf28ja/9304471764.pdf
    • https://cdn.sqhk.co/wimiwupo/cVhhjfU/the_amazing_claw_machine_hack.pdf
    • http://nesegejisivinu.medianewsonline.com/63904616523.pdf
    • https://cdn.sqhk.co/bolukawet/1hanjgj/motogp_20_nintendo_switch_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rojalexipokadaz/windows_narrator_keyboard_commands.pdf
    • https://s3.amazonaws.com/zetubakuz/adhe_kangal_old_movie_tamilrockers.pdf
    • https://s3.amazonaws.com/didowugorokirug/zutolikelapifija.pdf
    • https://s3.amazonaws.com/regovadeje/33389932646.pdf
    • https://s3.amazonaws.com/lejivugeleguwod/wapakosakuv.pdf
    • https://s3.amazonaws.com/miledu/what_is_the_latest_news_on_the_fires_in_california.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_off0000e7bb.bin
14042e1b82906ae397c9340c902bd77a3c68b230155d4f3b7eb62e8cd0bf4af0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 5676 bytes
font_01_sfnt_off0000fb04.bin
1ca53272e7d9879a1a79b5c8e055f5eebe09d1f7c448e2bd8ed75e116b389aa9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 11740 bytes