Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26173ea2dbf7f8b…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 08:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fe0d5d61ba6bbbed867735cc613266f SHA-1: f038e40d9587168ca82cae0f532721fb83ec5cbc SHA-256: a26173ea2dbf7f8bf81ebf295716db94ff9031ece67312fb265cdc5520329232
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to obscure the final malicious destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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=mkx+mobile+mod PDF link annotation
    • http://stphilomenaonline.org/userfiles/file/dugotizixoxeweluwulalu.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dixumuvokujidot.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/43340073620.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/96582802878.pdfIn PDF document text
    • https://proia.bg/userfiles/file/nexaperizepuxa.pdfIn PDF document text
    • http://allier-genealogie.org/File:/22658629837.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/20334706970.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/lunufa.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/53036938886.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/54327291433.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/57018494536.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/52782390195.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/98706282.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/81746359275.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613badd46cab1---96686726154.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/80330268307.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353eb3b6e9c---46809294303.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/19596203066.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/96152112909.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/27061253535.pdfIn PDF document text
    • https://kaparatt.com/images/File/nigetux.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/jasajufisamomumoteve.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/suxiwedevop.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_off0000e387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE387 19012 bytes
SHA-256: 4b7f77ccb49e7a5eab7fc6dfb2af93614196ec61058982e5a0dc31608872d371
font_01_sfnt_off00011536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11536 10104 bytes
SHA-256: 5999b999c9e87d79df5f947aabb360f196e68d36899baae92a05d4b7e1b308ee
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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