Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa9d461a609117c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 19:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f5506a30cff0338636bd6c4584eb067 SHA-1: edd6e72b5f48d26a054dc5f1d47b745c39299c17 SHA-256: 4fa9d461a609117c92afb5f7c9ed201d847f84b08f9a2b0c6d6f101d3ead60ae
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple external URIs and is flagged as a social engineering attack (ClickFix) that instructs the user to run a command, likely to download and execute a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=call+of+duty+modern+warfare+3+free+download+torrent PDF link annotation
    • https://greenfuturevietnam.com/Upload/files/moxusetawa.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/xipovenejudegon.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/kiriboninisimalizada.pdfIn PDF document text
    • http://benetalent.com/upload/files/lagobutukipogeketimo.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/rawesidokibefur.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/jesunu.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210901185644_tmhwue.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/80724703065.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/joxexewimivobatebodotunu.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/jerararemofirakupusi.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/41973158870.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/60575717382.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/mepesiwizikukimaku.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/fd12ef238f18a6a225018d8fd9f8c823/6995842172.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/41704983573.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/5286942490.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/76292229411.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/48740892985.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/pajasopaxijodobuxubuxim.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/kamaju.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/nevasojuvadowunofal.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/11139119825.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/98632326685.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_084752.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 10756 bytes
SHA-256: 2a096fc2fb832d94cb17b285dc90d51ee6e275bc02c26f2f7647e82268e27733
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 19468 bytes
SHA-256: d19ddef06009bf16342e7b113506ad8b3f44c67ab92afd0a9c0b6e22d8d5ae09