Malicious PDF — malware analysis report

Static analysis result for SHA-256 51586c0f962bdbfc…

MALICIOUS

PDF

73.8 KB Created: 2021-02-26 11:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a0ebcd946b803e5888b3021cc9876880 SHA-1: 938386f1f4af7b2783c31f71e11bce93a58d1ada SHA-256: 51586c0f962bdbfc23d0f8d1c2508641705c4b6a7a1bd4e3c8acf61788fc5bbb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=focusrite+18i20+driver+update PDF link annotation
    • https://cdn.sqhk.co/gogerazina/FjiGjhM/ravensburger_werwolfe_vollmondnacht_anleitung.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/dib3gjc/58022409997.pdfIn PDF document text
    • https://zexawowa.weebly.com/uploads/1/3/6/0/136081798/3928224860e32.pdfIn PDF document text
    • http://hookup666.site/briggs_and_stratton_replacement_part_numbersjnocp.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/uj8hhjd/xilitifomirif.pdfIn PDF document text
    • https://cdn.sqhk.co/lemijexo/CQfPGif/54411457576.pdfIn PDF document text
    • http://reduslimitaly.website/game_bike_blast_cheatiwdvv.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/2479841.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/jjfic10/kit_viet_nam_dream_league_soccer_2019_tottenham.pdfIn PDF document text
    • https://cdn.sqhk.co/noxawuge/jbpCxjh/deemo_reborn_pc_vr.pdfIn PDF document text
    • http://trellos.fun/free_labyrinth_walk_quilt_patternrt6v2.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/580577388a.pdfIn PDF document text
    • http://ita-yog.space/wabukidafotuxgwbxu.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/lfFjezl/attractions_near_chatuchak_market.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/5ZcBkAX/monkey_mask_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/negenowiji/hwgghcb/68320276534.pdfIn PDF document text
    • https://guverududilo.weebly.com/uploads/1/3/6/0/136086053/658c4c.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/gopuze/64118580551.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/what_are_some_godly_characteristics.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/planet_fitness_membership_cancellation_form.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_off0000e236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE236 5568 bytes
SHA-256: d46385e17d3b3716649881eebddb62d4cb3d399a450f8e7acfa37922fa5af1b5
font_01_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10620 bytes
SHA-256: f150583bd70e13c536cfc490b3f78b694bc4400c04b532d3beba136d08c6fdc1

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