Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4972f6d5b9e0f7f…

MALICIOUS

PDF

67.7 KB Created: 2021-09-26 21:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cc5b5e119ae4f6f3f16a8c181146501 SHA-1: 7587d52a8bec9f182cce5882584e6f2cd618cd15 SHA-256: f4972f6d5b9e0f7fd0664ef6f5ae72a66a09f7fc423a85466c3c01140efb1a79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links designed to appear legitimate but lead to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krisoc.ru/uplcv?utm_term=hack+snapchat+password+on+android PDF link annotation
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/tonakimuj.pdfIn PDF document text
    • http://balone.net/_upload/file///gulalipilibo.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/tukub.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/xerifetarovukiwa.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/75472925725.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/sojozodinu.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/rilexuduxoliwasal.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/2793289487.pdfIn PDF document text
    • http://leguido.net/files/fifakamuzit.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/84715613624.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/17299002905.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/a9ddd875e57e0c99c5874e4367450748/29005902356.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/22110377096.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/masivejaxedadivud.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb974e2df---moveditesazakegopagused.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/liwunonutemumipadu.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/56925304842.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/14878291512.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/fuzunoliwufitixozaf.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/90650215406.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/52615435381.pdfIn PDF document text
    • http://393citizen.com/upload/files/bujilojobivebute.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/wewalewovokararuladuxider.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_off0000ac5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC470 14700 bytes
SHA-256: 95e230d242474b21111be206a992f7522cf4b7ad9a57e75b8d686b9d72e1ec91
font_02_sfnt_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 10604 bytes
SHA-256: ea1f7107a50b962cf107594952ffde79f5fdfe153755a2c60480d05cd8189588

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