Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e645b7c1ce97ba…

MALICIOUS

PDF

87.5 KB Created: 2021-03-28 07:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3f979419c8a1ad5cd355ba8435f52185 SHA-1: 580beb5343d81deaca405591548ef38e3000e989 SHA-256: 43e645b7c1ce97baaaa1a2d74b8b21aac7b7596bc06144146060eeff4d41b999
186 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/award?keyword=astable+multivibrator+using+555+timer+working+pdf PDF link annotation
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/8e4dfb16e62b6b.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/eaff0ea.pdfIn PDF document text
    • http://zerudomafiko.iblogger.org/the_zookeepers_wife_book_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/mjarge3/national_geographic_traveler_subscriber_services.pdfIn PDF document text
    • http://canlisohbetim.net/the_secret_river_andrew_bovell_quotes2our5.pdfIn PDF document text
    • https://cdn.sqhk.co/givifevulo/0ighije/soccer_world_club_challenge_2019.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/ef15f2.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/python_dictionary_update_keywkz27.pdfIn PDF document text
    • https://betogazubi.weebly.com/uploads/1/3/4/7/134768910/taronekotajovovaxix.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/GUgcUgf/virtual_tennis_challenge_mod_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/dJPPDih/twisted_x_mocs_purple.pdfIn PDF document text
    • https://sosuxivi.weebly.com/uploads/1/3/6/0/136056733/fepasuwoni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d798de41-6847-46d1-b877-4f1b84f556ee.filesusr.com/ugd/3e315c_6b4cface95e946e8a35b27add3a1b78a.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_6941b2f7305148d5bb91f60cad99a6ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jusuberu/rawililofejimu.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/julius_caesar_act_5_scene_4_sparknotes.pdfIn PDF document text
    • http://rotaduwifomol.rf.gd/xabesogosakijotad.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/black_foam_sheets_michaels.pdfIn PDF document text
    • https://b9264059-5ce6-458a-812b-58b21e0c51d1.filesusr.com/ugd/9a3dc1_de24019b822541608973f781da2acd0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fedure/pideluwedafo.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/danby_premiere_dehumidifier_best_settings.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_946c22c78ca040c6995158eda8b98b9b.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_3bd63dd419a144d1953ab83ed43a9d97.pdf?index=trueIn 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_off00011459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 5832 bytes
SHA-256: eede794c9e680376a1568e64f84dc8cab5464937f3b2905341844cb1080c8dd8
font_01_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 11772 bytes
SHA-256: 238544c25a5df583665f0bbd97ceb77ba2eab508d0b392419e3f7371f7f5636e