Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c0791933ce4a2d…

MALICIOUS

PDF

93.2 KB Created: 2021-05-27 07:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: acc343578178e5b60d85d88edf660df1 SHA-1: 8368940795266a0ad0f6fc4794a345b8795b3e78 SHA-256: 51c0791933ce4a2d253a105025319554d095f0db438cbe718dcc6dc04a67b84e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, mezovuduv.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to professional dossiers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=dossier+professionnel+exemple+rempli+gratuit+arh PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446036/normal_602c3b9a1da65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_602868e78b199.pdfIn PDF document text
    • https://bomirilipaxotez.weebly.com/uploads/1/3/4/0/134096722/viwejupas-tisabedala-gumetojazubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_60133629ca8ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463809/normal_5ff1b9bf27bb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_600e4321e52e1.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/kimiz-valinud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fe9883705ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_60611f0023870.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485689/normal_5ff4b9eb0b93f.pdfIn PDF document text
    • https://gufagopa.weebly.com/uploads/1/3/4/6/134660265/moduja-luruveworodej-vewenalivep.pdfIn PDF document text
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/6345288.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_606164d4640db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_600ef911cfaae.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/26942edd-ad2e-4786-976c-a0803dc00e79/nokor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1f1b82-9110-49f8-9f2d-d4758432c8bf/mawizeputaxesenotikolef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925d780c-3796-4227-8c5a-cc143a81a1ad/el_libro_de_los_abrazos_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6e419b-f94f-44cb-a468-aec9f9130034/how_to_smoke_a_brisket_in_a_big_chief.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19ee652-f906-4577-b413-03814eba17ee/38857755088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfec1c2-4ae6-466a-8fad-611452ca8b39/wugeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401fb123-fcd9-4740-bb02-c90c45ba6dc9/motorola_moto_g6_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89eaee22-bccb-4d15-85a8-ecada8026dba/76567376627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd28f02e-7c3a-4bb3-a5a4-1da56ca77fd8/lezel.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_off00012886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 5384 bytes
SHA-256: 0da69067b1d63b0cf50917790294b3715f0db1af859bf64cff2f7374df238014
font_01_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 13648 bytes
SHA-256: 9156a862f9fe8fd41dac0dccff32c810d8137f0c3ddd160d790ac004875c6c45