Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d32aeb856d2c152…

MALICIOUS

PDF

59.4 KB Created: 2020-11-18 12:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 59ca3d485e76f16fb5afcbf33bb96e1c SHA-1: 91f0def18797b4289ecc0a29dd37ee6e43c94ef2 SHA-256: 2d32aeb856d2c15222d5438b0b562b95d1e0bb9ecc368e89688532456a1af9dd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a link farm designed to redirect users to various external resources, masquerading as a document about 'Animal Farm guided reading questions answers'. The primary malicious URL identified is https://trafffi.ru/strik?utm_term=animal+farm+guided+reading+questions+answers. The presence of numerous external links and the ML classifier's high confidence score indicate a phishing or malicious redirection attempt.

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://trafffi.ru/strik?utm_term=animal+farm+guided+reading+questions+answers PDF link annotation
    • https://vikuregarune.weebly.com/uploads/1/3/4/5/134577585/pakasumib-tesapozixo-fobexa.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/400236.pdfIn PDF document text
    • https://famotufenimuz.weebly.com/uploads/1/3/4/1/134132127/xazumogu.pdfIn PDF document text
    • https://fowaluta.weebly.com/uploads/1/3/4/4/134488886/wezupa_kezuzurujo.pdfIn PDF document text
    • https://tijujuvuxerupuz.weebly.com/uploads/1/3/4/2/134236121/9983265.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/biwukudejosob-siwizobo.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/e2739d4d-05bc-40d0-86b4-062874240627/sfm_failed_to_lock_vertex_buffer.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/owl_pellet_worksheet_elementary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7ea431-fa25-4f93-985e-79acf929a12b/xotabizaxujapak.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/lesumowifofugiwixug.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/jubukukasinadenudesozig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b079b8-03ab-45a8-8544-0af32acda58c/highland_oaks_middle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adbe7f9f-8cfd-4656-a16a-3155db65d51e/12480047439.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_off0000ac3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3C 5436 bytes
SHA-256: 0f1e64fe72f887552fb686ff46904f0965bd7f72f42bdf27769992d07a8309f8
font_01_sfnt_off0000bea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA8 9940 bytes
SHA-256: 15ac940f7ec55b17335f1bb2f65d05cb3416b1007b54fde734bcf881fa0aca39

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