Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6076b64ece692d2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 07:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 89c28be0ecefd8dedb953f7faa9fcf0d SHA-1: f048e3980115396bf9bc65eff2365a19bcf56ec5 SHA-256: c6076b64ece692d280121b1e184ca50933dfcbe6d9ce757cd4ecb31d0c3c6e9e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting it functions as a link farm. One URL, 'https://smidgel.ru/uplcv?utm_term=download+30+day+fitness+challenge+pro+apk', appears to be a lure for downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=download+30+day+fitness+challenge+pro+apk PDF link annotation
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/65756013505.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/90371228844.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/begufidakezivavivopuzube.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/burovifimigojideroxuzis.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/30018916433.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/68471559748.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138894b7f017---2774926257.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/2169599272.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///12322114320.pdfIn PDF document text
    • http://chinalabware.es/d/files/vaxawox.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/neposidivabumib.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/timejunojubade.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vogotur.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/sikcdcfrae7g943is92tq43dgv/wokoxixamaseximuwed.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/wunimojetikovasol.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/83845055970.pdfIn PDF document text
    • https://teamcode.net/upload/files/ledilozegusiv.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/javedumeki.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/nusitizakufijiriti.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/92562651647.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/merowubalaxofus.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_off0000c828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC828 17468 bytes
SHA-256: 1af26a256c2d9aef8ad418127475f97d9c5d44409a2f5a8ab5d8e55915a057d8
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 11484 bytes
SHA-256: e1ac4278e36a8b45e062624e2bd522291117aaef8164d899d5c64bc98768dbce
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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