Malicious PDF — malware analysis report

Static analysis result for SHA-256 a308f7e09b3a6929…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 17:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2faaeab74f386b7d8e7c0fdd11b1ce1c SHA-1: c2d21644b8d022219b9700154197c8740214a4c6 SHA-256: a308f7e09b3a6929d72fa531178ae1aa0865727a2974af6afec792b1b16f0de6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, with critical and high severity heuristics indicating its nature. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to lead the user to malicious content or download further payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential link farm for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://degrossier.nl/uploads/file/wavak.pdf In PDF document text
    • https://casaalu.com/luutru/files/nesupirotijetit.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/21664200814.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210908102436.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///23379052095.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/14109574962.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vunigegoluvazox.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/rabivubokop.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/81775701721.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/76731611746.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/zuvejor.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/jawig.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/49696479078.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134067334fa4---menagitebibafa.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/wilir.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xuzegoxikubinagetuxodix.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3272b717222d2423d102f342a352632b/bofugeruriwina.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/wutotiduxubejubirufudofo.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/33529973984.pdfIn PDF document text
    • http://hbaoge.com/upload/files/zokiwimewilenuvilelup.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/muralejojobodesodi.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/82475514117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+z+season+5+episodesPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/57638404169.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_off0000cba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA2 22352 bytes
SHA-256: 5896d1ef852dd5783e38979ece747e53af3ae315709cdc744ff7e7e45ccf4acd
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 10804 bytes
SHA-256: 6fd49389cb7356b09c56385377e9b8ccd3332a8599ae2ff620e728f55177fef9
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1