Malicious PDF — malware analysis report

Static analysis result for SHA-256 711187bfcb6aa017…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 07:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5d1e8f80cb93f7e4b436c5daa0dd7ce6 SHA-1: 02232f7b4829a9fdcc8e98390e4ca0d643d14d91 SHA-256: 711187bfcb6aa017eda15556535db631b77487950734a1816ec2788f17382c7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=jar+emulator+apk PDF link annotation
    • https://zerling.eu/nico/images/files/56193310790.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/95611356566.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/batapibikojawobenozuj.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/20642031809.pdfIn PDF document text
    • http://lactopad.com/uploads/files/welugobegeso.pdfIn PDF document text
    • http://fullx.net/files/juboraberoxotinafup.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/87858499138.pdfIn PDF document text
    • https://rippa.pt/files/file/85502194099.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sesubavipejur.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/8681608798.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/wanokijobozakataxubaji.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
    • https://theipbuzz.com/images/file/lebiferiturunesex.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/95444220189.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210901101931.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab656bce9---mabegegogi.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/tujugesujatavawetikodako.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/83249696737.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b2624d3dc---jedisawevivibuxujubip.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210912132902487789.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/53225005376.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/wabumegewexanugilapilo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210901091011174829y7w4ct.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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 10232 bytes
SHA-256: 42374fce9f01fda6c9894aef42b19fb94266d784178d9153fb03ae309b419ec6
font_01_sfnt_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 16396 bytes
SHA-256: b1ed0e739ccb7b0f3984a9fee44a3c9f4871172aa89e02f0bbe1fe11ded51a48
font_02_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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