Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32a2b96db4e41d8…

MALICIOUS

PDF

83.0 KB Created: 2021-03-18 18:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 615632416051ff6f88ecbea9ed1fb0d8 SHA-1: 2ee4deffaba589df55c586952db30ca36bbbbe5b SHA-256: b32a2b96db4e41d82ad91c562f6f30e5ff897954f3e8c1bdc03bf57337358bf8
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=buy+carry+bags+near+me PDF link annotation
    • https://numojenemisuben.weebly.com/uploads/1/3/2/3/132303045/leket.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/hgHVvid/xipibapovavixedatovi.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/TjiUjg2/how_to_make_best_gliding_paper_plane.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/how_many_tournaments_on_the_european_tour.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/cask_of_amontillado_questions.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/how_good_is_16_personalities.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/9870552.pdfIn PDF document text
    • https://zasoliwex.weebly.com/uploads/1/3/5/3/135318241/bividaruk.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/mhhOjbL/game_center_apple_support.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/hgejgid/bearing_size.pdfIn PDF document text
    • https://gafabudadu.weebly.com/uploads/1/3/1/3/131384489/4061172.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/hyCibjg/minigiants._io_hack_script.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/70616572970.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/9ifiegi/monkey_king_movie_animated.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/85879191343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/20412631522.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f812d11-4a68-43a2-9a56-708e9296cf95/sales_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ee6cd8-0399-4867-b8dd-72621b3c1cfc/will_festivals_happen_in_2021_ireland.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/how_many_volumes_of_tokyo_ghoul_root_a_are_there.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 5380 bytes
SHA-256: 3345c230a32e689e7eeb4bb961f6c10fa49495c225c1f9f4f4284217a18185bb
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 10224 bytes
SHA-256: 99215eccbd88bd52e48f471f4660e3475ef2712195a606aaf5b5a31fe28824d5
font_02_sfnt_off000129d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D1 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8