Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86dcc1bee331e99…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 10:44:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f0e0c887b817731c36a05cc0265a9739 SHA-1: 32c610184d6c0e059930d37e41184c4fdfa9dc42 SHA-256: d86dcc1bee331e994de7cc862785c78ca86e3311886c4b16b714e37a349c5895
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the PDF's primary function is to redirect users to malicious websites.

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://catamma.ru/uplcv?utm_term=igi+mod+apk+download+for+pc PDF link annotation
    • https://toptenstudy.com/upload/files/BodyFile__6130512C0CAF5.pdfIn PDF document text
    • https://cmoretv.com/userfiles/44736482407.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81036416512.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0c4dbebccabdce112cb871b3c9c009d4/31709307275.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210907_D5D3B66A9E952B08.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/tubewavabelikalelupefo.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/mirezu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/58393555616.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/96548969117.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/kovonibukewenujalerazowi.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/55358895285.pdfIn PDF document text
    • http://maidichike.com/upload/files/70196887206.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/tuzafolab.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/47467771765.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tabaj.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/xavejawek.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/kodujon.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bojujixumududob.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/pizaxirulelawinuvuwakumuv.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/1812470784.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/2530159665.pdfIn PDF document text
    • http://creationart.hu/files/file/lojifajejinelofuz.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/58508658556.pdfIn PDF document text
    • http://wdnederland.nl/file/62048954677.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af301ba49a---96059364512.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_off0000b3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 10692 bytes
SHA-256: 0474a630e433a6f226de24cf27b9bcc15f5724a8ecaf8d08b6da75608206d332
font_02_sfnt_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 16820 bytes
SHA-256: 38bcbe62eccda86400de0bd366e06f6358135d278aa494a3c504c05ff19d7b17

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