Malicious PDF — malware analysis report

Static analysis result for SHA-256 333d1ea5f132ebea…

MALICIOUS

PDF

80.7 KB Created: 2021-04-18 08:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 641756146d9746b5f08490de7672e087 SHA-1: de2843610b5f8e89b66b2b29ef4d5b07332a4ea7 SHA-256: 333d1ea5f132ebea55d2acb6f2211556bd6c62ae437fb7ba28ea21da53bf7400
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+many+carbs+are+in+sonic+popcorn+chicken PDF link annotation
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/manubojuvo_semowopomopetel.pdfIn PDF document text
    • http://dodajavux.scienceontheweb.net/42695574103.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/mifonijoneriturefenu.pdfIn PDF document text
    • https://bemuzulezevateb.weebly.com/uploads/1/3/4/4/134440878/wopopaw.pdfIn PDF document text
    • https://waxuxugiw.weebly.com/uploads/1/3/5/3/135312989/sopimiziv.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/a636bef4f9.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/xofememegopa.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/40301062949.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/7322018.pdfIn PDF document text
    • https://nezikuwetop.weebly.com/uploads/1/3/5/3/135346993/nikikif_gaxanimijufomos_jurosifukuwomi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/renuvivirulunajoxa.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_0a27f6562f5649acb3bba3ec8319b2d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/16849342491.pdfIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_4a0cd1b700b7465fb00616ca1636271b.pdf?index=trueIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_afc883d8ecfd41f18c36a23761f0cc43.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_e9e4040f0fa546a7bf9cd3ddd86c27ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/19499143573.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/liditovixakalibepowuxu.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_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 5500 bytes
SHA-256: 7e0d265b7a1abd47de249f29c76af1aace6fd5556fefdc591390881c42ab551a
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 1940 bytes
SHA-256: 414d786b459f0f5d2a731291ef1b870d88176140611ada2eab9f82aaf6e76e23
font_02_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 10924 bytes
SHA-256: bfc0c2aa6629411a75ad01672b3706b586510820225c43ad2d6fddebf47f4e7c

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