Malicious PDF — malware analysis report

Static analysis result for SHA-256 b94f2ce4245a9016…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 17:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d8035529b46f3200f813416867c2f10 SHA-1: b0e3cdeaaa313b5beb6e65c2801b53fbecde6161 SHA-256: b94f2ce4245a9016ede0aa884a824cf245d75225edd010792a021c7df06d82a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on disposable domains. The presence of numerous PDFs with similar naming conventions suggests a campaign distributing malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://huntic.ru/uplcv?utm_term=cat+in+a+hat+book+pdf PDF link annotation
    • http://c2ctrading.org/cms_upload/files/46970519499.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/fewurepoge.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/28484420368.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/pezukibafexakotifuvoj.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/39139626772.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/55860851760.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/pigunidaxivuk.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/doduvenudepu.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/88623687017.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/wugitatojuro.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/rebuvuvipuvujavizutikewum.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/67262489703.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/sigiselopitodep.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/35962541236.pdfIn PDF document text
    • http://i-physiology.ru/upload/2125341408.pdfIn PDF document text
    • https://ipkameros.lt/userfiles/file/50259746728.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/rokerixizapigezefudat.pdfIn PDF document text
    • https://xn--80aggmy8c6c.net/UserFiles/File/29697380497.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428d30cec08---nakobawepolinofijaxavew.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/21402402547.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/sixaxemadajixerixa.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sowaka.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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 10412 bytes
SHA-256: 3a4fe0a7996e57fbfaaa7741e51f4671d6c845e408004d6f171c7c4ccf374038
font_01_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 17836 bytes
SHA-256: 0287dabf675069478a89b7bb50b08a4baf79f0abe0f41e8cde13b821408cb45e

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