Malicious PDF — malware analysis report

Static analysis result for SHA-256 485be57f3bedfeb3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 22:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1dc69ef87c9534cac6e84473a63f6a8 SHA-1: 038e8438779c951112f77bc80b93d29dc0e28601 SHA-256: 485be57f3bedfeb303ded39de271b174cf530a42fdcc363925a9c53ea0de4228
214 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and external URIs, indicating malicious intent. Heuristics indicate a social engineering attack (ClickFix) that lures users into executing commands, likely to download and run a secondary payload. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://pistant.ru/uplcv?utm_term=android+reset+dns+cache PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca9d3f218---66645398029.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/besokapamesalojuxolitiko.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/54579197851.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/52657148335.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/69450643121.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/ribimepowop.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/vefobepafetukuxitajataga.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sawekajudezuwasese.pdfIn PDF document text
    • http://guowangcable.com/d/files/31257852650.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/88625051244.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tarepuxinedokegafigeres.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/24811193446.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/23857477359.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210914_6EB937F6075FA691.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210902052423.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/72041217991.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091019225140.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/tukapadagenil.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/98592533818.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/fediluli.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sufumokaxadupidewot.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908144710.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/45710932355.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/71227575913.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_off0000d7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BF 10404 bytes
SHA-256: 0d9d2e03a5e9de314ee23c4fe651acdeaca454e3d7c566e632864d7d57a9dfcf
font_01_sfnt_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 19260 bytes
SHA-256: c191f46bb8a95a95a583768867d0cc957fb234d6d6599fa7e2db644577a76beb