Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad3cf9d241b2462…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 15:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 89a84c6dfa49830688bf9ca16de1a0a7 SHA-1: 5be2cf03f30e5216300410e9af4dfe2829769010 SHA-256: cad3cf9d241b24626a6b2740d7dca1d864bf4f100c4f28173d9ed115ebf09d1b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing, with a prominent heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as https://ketchas.ru/uplcv?utm_term=red+phone+icon+android, are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ketchas.ru/uplcv?utm_term=red+phone+icon+android PDF link annotation
    • https://charterfori.ir/basefile/charterforiir/files/59962029117.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xikirozivegofi.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/tuvadezemisaruv.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/mewomixuwe.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/goganozepokunoja.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/vedokuwopuno.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/kaxapelagixomiwokamuxoje.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/37417446874.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/xazijexiso.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/tajelajeravujiroxu.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/lulurizumipimazuwutare.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/funobopikirewagisetig.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/darupanudobuwoje.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/31028164423.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/67299209646.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/fazuxuvanujakowatokuf.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/56646041986.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/dcf82ec567d819ccff924abe05b5b229/kulodokadere.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/71017290765.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/jugedovikuruva.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101838239460.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/61013199719.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/52701137795.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/44140095989.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_off0000ae7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7F 14236 bytes
SHA-256: 0aceb080644c51f7a57371a1b04c0974b0b8c79b97959fc9e0f0b16b2b5da884
font_01_sfnt_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10344 bytes
SHA-256: 5b91288e5fb83aaac36a899a8057cc95fe8e5de2f2b83ce444498aa5838c1981
font_02_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1