Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84f51ac972399e2…

MALICIOUS

PDF

90.3 KB Created: 2021-03-05 12:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5566cb6b301dd0b37329f8e3530abac0 SHA-1: 71ddc4e969b99c46f131026f18bad82c0a4fbbe1 SHA-256: c84f51ac972399e2cb1ad7488d2995e2fa3988987ba91f759e4f22961d828e9c
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'xajibur.ru'. The presence of a large number of external links, some on disposable hosting, suggests an attempt to direct users to potentially harmful content or phishing sites. The document's structure and the heuristics fired strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=who+narrates+britain%2527s+most+evil+killers PDF link annotation
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/ede1d.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/gafebuwubifo-dubob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_5fc72be013334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_600cf173779a1.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/febata_zurapap_nufasuparalot_vijav.pdfIn PDF document text
    • https://xepawonim.weebly.com/uploads/1/3/0/7/130776577/5ba49.pdfIn PDF document text
    • http://tumbochka.space/4130659452u6f9d.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/f0c928054879.pdfIn PDF document text
    • https://gebobofivogaxe.weebly.com/uploads/1/3/5/3/135308574/5389297.pdfIn PDF document text
    • http://geosen.net/long_division_with_exponents_worksheetufudx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fddd6e71da2c.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/afb6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fe0f0aa44645.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/niwumus.pdfIn PDF document text
    • https://jogabaxeke.weebly.com/uploads/1/3/4/7/134704809/9370865b13b5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_600f292846eed.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/b5172ab0-3c33-4a3a-a879-288568ae8c77/86586875123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ccb8c1e-ac80-40e3-b873-50a3f32906fd/how_do_i_turn_on_wps_on_my_hitron_router.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_42225ccce6d24b60a67ae33e0bc65982.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_b5554bdfb122436abe82b5cbd793d40c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32fc878-ac12-47fd-940d-4cd194cb047b/what_are_the_types_of_tax_incentives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51493ea-e650-4256-ab35-45175a548edb/22895199577.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_51f233064e234893b5978b2d2833ff6a.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_ec052db8945745108b1ca793818e9c60.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_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 5236 bytes
SHA-256: dcaf45847996cf77958b282afd247c05c3fae24660d3b07d4ca973d9cbbff627
font_01_sfnt_off00013639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13639 11060 bytes
SHA-256: d77ef6d719e06161e59730e95c6f7a839f4a25044dbaa4863b867492df687e6b

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