Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae9f286443eeac9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 06:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9315508772e02d79f4df0d5049681fc0 SHA-1: 6decd7b6e32696c5902178bfac84629feccfa522 SHA-256: 0ae9f286443eeac9e299ce5c3234199fd3759c616232be1053a1a67f0fd65ef3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=tima+app+screen+mirroring+download PDF link annotation
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/jobazemiv.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/35878783935.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zajodoniridotixoza.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/62354094794.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/61870511440.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/13061477533.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zexopevukaje.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/93971249679.pdfIn PDF document text
    • http://partnercable.com/files/mamubenekonaj.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/abi4tebvkpi0v66o2avu461rq9/78718724149.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/wibifiporimomusunuxog.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/jonokes.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/pelunufebagifepewobi.pdfIn PDF document text
    • https://davaocarrental.com/images/file/92614601568.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/34685170042.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/memep.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/rimonewetegezisofufefag.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/79929794921.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161430b15afd0b---57625066593.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/witakijugibip.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-18/20210918065923115097.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/gavezo.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/bosizexadonuriporixudu.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 10808 bytes
SHA-256: a584a033ea06c82bd9f95b55124fde46b71dbd1aa48d315ea9262b517de16c9c
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 17924 bytes
SHA-256: 0e042b6e205ba7d8f79ac1368198d7be8e12183225401488e51d1653035f458d
font_02_sfnt_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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