Malicious PDF — malware analysis report

Static analysis result for SHA-256 830144dcf82649c8…

MALICIOUS

PDF

114.7 KB Created: 2021-05-17 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e06d3ad1a98aec616199067f81f35c49 SHA-1: b35b7d33e9541415ad6bb273ea87037d8c9e872a SHA-256: 830144dcf82649c87daba819f523d86a0a9cabc0fb704fd908d5f6b53ace1bb1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and one primary malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded URL and the heuristic firings suggest the document's purpose is to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=letter+to+birmingham+jail+audio PDF link annotation
    • http://ritokofofuwubed.iblogger.org/combiner_deux_fichiers_en_ligne.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/pejodokivi-tojewexusafod-jatabuti-xazukizusom.pdfIn PDF document text
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/tinuwotabomukudigu.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/c1b78a8e-c796-4c07-918d-f077ce9de112/what_is_a_due_diligence_request.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_30db8a3e133240b992180ad7052bdb6a.pdf?index=trueIn PDF document text
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_7ca2b7b9b7ea48a78a9279278769a6c6.pdf?index=trueIn PDF document text
    • http://xotonibipined.rf.gd/spotify_premium_apk_free.pdfIn PDF document text
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_2ba967ecd391455b9ab7b864d4514b59.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc5ea30-7f9e-4844-bedc-9b995d5da6c4/craftsman_planer_molder_knives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6751b141-58ae-49e8-8ea8-e264e5fe0192/belawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22608995-1390-4977-a9dd-f715431e080a/wevanama.pdfIn PDF document text
    • https://aa6d2f86-95e2-42cc-897e-6bbd71c3a116.filesusr.com/ugd/78daac_430e7742897240eba546026911071423.pdf?index=trueIn PDF document text
    • http://jipowefata.epizy.com/15748640169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1170a58-e320-4f14-a2f4-67b02378f2d4/kidogusowufegijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17d7c8f-febf-4a8f-aaf3-755e8ea574e1/rikiburawipovuwapuserule.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_9c031492d8d34ffa91d9aaabbd234eb5.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_a9f1d6b62c3c41c3a14c8d14503bdbcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c4155f-38b9-4f90-b1b8-1c67b74b973c/56425404411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e7def2-f36e-4858-ab5f-2d14e071b63b/zagedodezef.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_off000185bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185BB 5216 bytes
SHA-256: 1cfbd30b3e482e3de5df6d51e4d271d4a163245d75210277975784d1b99e545b
font_01_sfnt_off00019752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19752 10948 bytes
SHA-256: fbdb320ebb1af7785fe8451b605ade079e79ea5d6087a99c2d41538f01c2e599