Malicious PDF — malware analysis report

Static analysis result for SHA-256 849290f6b01c1234…

MALICIOUS

PDF

84.3 KB Created: 2021-04-13 08:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2456bc835d60f9fddb1a75673b5ab0d5 SHA-1: ae1121f6b6c439c16d58eaf43e6346ce4a0edfc0 SHA-256: 849290f6b01c12344bc58e3387b5965f02a6943831abe52c569dde8e3b7c0518
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://golowaki.ru/strik?utm_term=runehq+creature+of+fenkenstrain+osrs PDF link annotation
    • http://ketousa.site/vojusaditaratobedinomekbzdhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_60637ce4e1d8c.pdfIn PDF document text
    • http://baffer-shop.space/xetukawuranapedivinoziru6q5b7.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/1511186.pdfIn PDF document text
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/neratobid.pdfIn PDF document text
    • https://bojomuse.weebly.com/uploads/1/3/4/4/134462584/fc39f59bb3e9fd.pdfIn PDF document text
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/1493401.pdfIn PDF document text
    • http://citruss.space/how_to_remove_pimple_marks_in_hindi_language12sfh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403689/normal_6032d09e172ba.pdfIn PDF document text
    • https://binazinir.weebly.com/uploads/1/3/4/1/134108718/rimazesadibe.pdfIn PDF document text
    • http://grizhoff.ru/7521507330m556t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_5ff7fdfd48199.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fc8d3e7848b7.pdfIn PDF document text
    • http://vovpomnim.ru/84899116198fdspv.pdfIn PDF document text
    • http://smallita.space/97961952044hbya2.pdfIn PDF document text
    • https://tasufevijusenix.weebly.com/uploads/1/3/0/8/130814010/voxejawefatab.pdfIn PDF document text
    • http://mandarins.space/kafezireb9zwd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a43602cf-b3f5-4d52-bafb-e8c16213ce5c/jugaditos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca0831e-78cf-439c-81ea-c81a7bacc99d/64349809073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897a3213-3161-4f71-b79c-4bc72471b075/can_sodastream_co2_be_refilled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d309ca70-7393-41b9-8227-9d0970efba3d/is_there_a_need_for_real_estate_appraisers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ce09896-9355-4155-a708-9d01d78002bd/rodipuzurox.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 5016 bytes
SHA-256: a32242b74eb5723c36baccc70d0ce9232f1099ef25d471a43bef4393936bd247
font_01_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 12548 bytes
SHA-256: db562da13083cbe1b2e484bfc0c16eb8ff40ba3b9526b5543a35be600e27421b
font_02_sfnt_off00013426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13426 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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