Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25baa319b6602ed…

MALICIOUS

PDF

81.4 KB Created: 2021-06-05 14:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e57c5ec661e42556420ed3ce4252f4a SHA-1: f708382828c8e2ce54517ec93428f9c0f509154a SHA-256: a25baa319b6602ed9de7d746beac0139b17a9eecaae0255830374a6cf49f2c2b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites, potentially as part of a phishing campaign or to exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=aha+acls+cost PDF link annotation
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/ziwitapi_xotonotase.pdfIn PDF document text
    • https://zunodeni.weebly.com/uploads/1/3/1/0/131070331/getuj.pdfIn PDF document text
    • https://nonewufuro.weebly.com/uploads/1/3/4/3/134334506/jobaz-boziwezivimu-zegaxuwix-lukefanixa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_6024afea085d2.pdfIn PDF document text
    • https://ganupedudajoz.weebly.com/uploads/1/3/4/5/134586443/3a600472.pdfIn PDF document text
    • https://todusoxi.weebly.com/uploads/1/3/3/9/133999566/8484688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_605501ddec226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab255bf0-a67e-40c5-b966-edef45cadb4a/mapivezedu.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413310/vepebekudejepebatotesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a413efad-1c99-4069-9def-cf53892557f7/how_do_you_give_yourself_a_buzz_cut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f815065-f66a-41de-869d-52b7f448de39/how_to_install_an_insinkerator_badger_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245621c6-839c-4928-aeb3-be4f62e4d54f/3476900082.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/w/file/fetch/144606492/litukogogadumiburo.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/w/file/fetch/144528147/jalenitabupabutuliruxun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925413bb-bb4f-42ec-be8d-9cce61ee5f68/tugori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4148704e-8eb5-493f-9181-24bdbdea8ce2/squence_les_accords_dans_le_groupe_nominal_cm2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf71afac-3303-433a-96d6-082504458cf3/majajifebinegajupader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e36b7aa-96be-4987-b7b5-3d91c92b9507/praying_hands_outline_vector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73a851e-f9ed-4cfe-97d1-081bd2c66768/bonibomateto.pdfIn PDF document text
    • http://sufasujozu.pbworks.com/w/file/fetch/144656433/cantemos_al_amor_de_los_amores_acordes_en_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b93c3d-e30a-4ac7-80fe-74acd67e357c/4238140249.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_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 4780 bytes
SHA-256: 5d3476baffb641eecd76e7a0dd7b8f79c7133ebbc30f47cb8a9c45e367c9d6fa
font_01_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 11340 bytes
SHA-256: 727b2a5bb185df6b1a750257b5cd5c97384906a2cfcb653eeae90635cf266ecf