Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d80b81afde67b2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-11 03:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9858b2ef6c5f74a746906c5c4595cbe4 SHA-1: 6365772333d7fa9c1147c1fe0be6adf5f5495a8a SHA-256: 59d80b81afde67b27ecaca676dc5272b63d31946e6bdfeaac87f467f2d26ca2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, but the heuristics indicate the primary function is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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://archism.ru/uplcv?utm_term=how+to+retrieve+deleted+videos+from+mi+phone PDF link annotation
    • http://tfforming.ru/d/files/51818618552.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/66832311213.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139253d8321f---17852379395.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wagokepumun.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/motosone.pdfIn PDF document text
    • https://alkoplast.rs/files/jowawakolexivewavu.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/nidakewobulisibako.pdfIn PDF document text
    • http://vititanon.com/user_img/files/vudomitupaxufafaxetob.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/90972047415.pdfIn PDF document text
    • http://eternaseguros.net/files/files/33585033509.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/54083077985.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/80018548989.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/1071761016.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/31569894586.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/78743574449.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bea5ed3fcf7f53b7e889e3c4050f2486/98165691058.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/12625019711.pdfIn PDF document text
    • http://plncse.hu/php_data/file/85315048250.pdfIn PDF document text
    • http://pointvirgule.ca/upload/editor/file/kolotisarerepono.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/vefulikogazuvato.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/lazulesu.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/gotivosomusawo.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/ronowuwira.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/limufowudiwajotepo.pdfIn PDF document text
    • https://akvaguru.hu/user/file/73488884375.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10744 bytes
SHA-256: a35ea799ece025fc7a1c3e64d408c307d1c2f0460bda9b0c1f68715e16cbeda2
font_02_sfnt_off00010b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B77 17244 bytes
SHA-256: 770965f6cba16dede4ca170c98241d9107e97a2c729777962c808fee6c1cd81a

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