Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21a8f7dba0df6e5…

MALICIOUS

PDF

97.9 KB Created: 2021-03-05 04:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1441ccdc4ce58e01dcacb978cc9e9b4f SHA-1: 0e62a08716e19f3a2ffc24b3f15c6369ef95703e SHA-256: a21a8f7dba0df6e5cc8c7bee58856c8cde132a3d369d227e7c88db249a116678
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent link pointing to 'golowaki.ru'. This heuristic, combined with ML and ClamAV detections, strongly suggests a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=seven+hermetic+principles+book PDF link annotation
    • https://jedarixires.weebly.com/uploads/1/3/0/9/130969076/tinezoxon_zitora_gobaf_nefurin.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/nuzagopelusasur_guvetowereti.pdfIn PDF document text
    • https://xejukogafowoje.weebly.com/uploads/1/3/2/6/132682905/4c6da501b3b.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/d3c6c.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/5c0899ecb.pdfIn PDF document text
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/6ea959fd.pdfIn PDF document text
    • https://jejegufixi.weebly.com/uploads/1/3/2/7/132740716/e2de411127b0.pdfIn PDF document text
    • https://xixefofitajeres.weebly.com/uploads/1/3/3/9/133999179/fedarepa-babivos.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://s3.amazonaws.com/kulinisokakewi/microsoft_excel_binary_worksheet._xlsb.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/mavakerugokavefuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/3402526019.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_5d98fd55c53149aca537742c4da3f564.pdf?index=trueIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_fef572c602f34356b5b1f6725b95405d.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_610d426f4e9f4cf0a132087d95a0f72b.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_0d0d8ae5acc745a98fc108633baa8e1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/gitutekepofilelaliji.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_57f125a9c1b94de18044289c5a4f5ed8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/17188854707.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 5120 bytes
SHA-256: 9f64c3de7ce2250d0dfc9a89f4a678e294b11767776dffe40ea0c251e3e1a033
font_01_sfnt_off00012d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9D 12200 bytes
SHA-256: 74ea6e3563e34b31d002232caf74a46c9f225155e4919fa82b7a84373e6e3321
font_02_sfnt_off00015657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15657 16132 bytes
SHA-256: 895f66822cee8096b629ba52ebdbe333aa959cf625638ac8af8884b25f69792f
font_03_sfnt_off00016b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B49 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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