Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3e1aba501fb9b2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-13 23:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb3d855b613ec1a3032eabcbd117f4fa SHA-1: 2b98d6609a643f6461bd51d030e7d4a89173f227 SHA-256: 9c3e1aba501fb9b2d9f3f7faf7d1afbbbc4a776212fede348f042ab83dc5ac4d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file downloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=killapps+close+all+apps+running PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/xisilev.pdfIn PDF document text
    • http://unityproductions.com/upload/files/71664607808.pdfIn PDF document text
    • https://blugarden.eu/file/57684385508.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/23016974093.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/biwegotopevodowokir.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210913205225_u3gjsm.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/29909435102.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/denibe.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/33020268465.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/28316468770.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/5699272302.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/domasifiviwidevegukefofag.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/61609050319.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/52671454730.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e733d32548---vomeverifiwuz.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/nabajoxutigujut.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/47540873604.pdfIn PDF document text
    • http://wwstationery.com/files/file/tozowiwavojeja.pdfIn PDF document text
    • http://masonhn.com/d/files/sofupakuxaraduma.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/68345862872.pdfIn PDF document text
    • http://samtle.net/ckupload/files/deluxagugivufejumivakopol.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/gisisusivutawi.pdfIn PDF document text
    • https://dafelia.com/files/30024021605.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e689a6476b---8844755329.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/41575260031.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_off0000b5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AE 16552 bytes
SHA-256: 725e04a927f30277ccf5ce765100f55754a1d455d1385386e23dfee6a175200b
font_01_sfnt_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 10540 bytes
SHA-256: ab371c2794a3a120659e05b417ab8423d1f8ec3682bfb44f9ffda38792b52571

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