Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86a4f1a1f031667…

MALICIOUS

PDF

65.6 KB Created: 2021-02-19 23:04:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44fd43b1a2d4937f57d489fb37fe6da8 SHA-1: 4462376ddfe3402febfdbeec217689618c5c8e38 SHA-256: c86a4f1a1f03166749b5e7431076fc63b887e8ecca6444cc068e232e8d79b789
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML heuristics confirm the malicious nature, with the ML classifier outputting a high probability of maliciousness. The presence of numerous external URIs and the link farm heuristic strongly suggest this document is designed to lead users to potentially harmful content or engage in SEO spam.

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://jacksth.ru/wix?keyword=neopolitan+rwby+wallpaper PDF link annotation
    • http://tifeguga.22web.org/world_of_dance_the_lab_school_performance.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/iOjhxhd/15510856986.pdfIn PDF document text
    • http://igafnd.org/how_do_you_write_a_descriptive_narrative_essay_about_yourselfyc4r0.pdfIn PDF document text
    • http://instofficial.online/vinawujojivoxevesopbima.pdfIn PDF document text
    • http://top-salez.site/alien_shooter_lost_city_mod_apk_revdlhtlou.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_5fd23aac410ab.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/jgijSiL/exploration_definition_and_pronunciation_of_cairn.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/gefgi3M/fafapewixilojid.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/jiHhgD3/pawabibadox.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/52gj8hh/game_maker_from_hunger_games_died.pdfIn PDF document text
    • https://mutikotamibe.weebly.com/uploads/1/3/0/8/130874320/gagofesogu.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/yidgghh/tiny_armies_apple_watch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385620/normal_5fe59492a91f8.pdfIn PDF document text
    • http://mx50off.info/wojutugetuwezimejivovutipbpzi.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/diiigic/21694370904.pdfIn PDF document text
    • http://skidki-day.store/silvered_weapons_dnd_5erw2y9.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/jAkicCi/lifavif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C2 4936 bytes
SHA-256: 9116b9e774f69c935b261784088a9689f3138e15f61b76c73fe627fe308b56a8
font_01_sfnt_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 10484 bytes
SHA-256: 8c6d6036f3141cf30c053efc2d3f65de09932b3ef202c0463efe821e93bcab52

Open this report in the interactive analyzer, or submit your own file for analysis.