Malicious PDF — malware analysis report

Static analysis result for SHA-256 8389a75d4a892c4a…

MALICIOUS

PDF

74.6 KB Created: 2021-02-15 11:12:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c1e4967fbb5d7961a8e07c132a133c80 SHA-1: 33fb8f083d00a78de443962c7e714accbbded15f SHA-256: 8389a75d4a892c4ae15912490836f333cf6c091833e32fb4c363e9f8f71159c8
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to a book review, intended to drive traffic to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=romeo+and+juliet+book+review PDF link annotation
    • http://halfraire.xyz/13485605257zeujk.pdfIn PDF document text
    • http://maxist.ru/employee_handbook_texas_template_freejfvz2.pdfIn PDF document text
    • https://cdn.sqhk.co/tesikotuk/tib4KGm/songs_for_mystic_messenger.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/gYkghhf/most_satisfying_slime_videos_best_collections.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/labox.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/CIbq3gj/honey_barbecue_ribs_in_crock_pot.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/WpVjiUQ/download_game_mobile_kick_mod.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/11575153.pdfIn PDF document text
    • http://xozonline.ru/airpods_apple_funciona_em_androidkdqkf.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/49lt91c/barbie_sing_with_me_karaoke_machine_songs.pdfIn PDF document text
    • http://lynciguest.com/one_goal_sports_spring_soccerzog65.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/832e8659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kukazowox/40853804444.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/rexizugevibutarumap.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/ranewozotirexiko.pdfIn PDF document text
    • http://sixuregorajaso.rf.gd/gap_men_s_jeans_style_guide.pdfIn PDF document text
    • http://pujusojup.epizy.com/ribuxememiligetetex.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 5232 bytes
SHA-256: 4e6b83dac47fc7910ad67c645097d15c9296bb1c07c5f39c80a9240b16792d00
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 10524 bytes
SHA-256: ac91d51a4eda2f66fd81f732285a00b7fb6bb20021ebbb00288482844c72a021

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