Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8fae36aa041956…

MALICIOUS

PDF

81.5 KB Created: 2021-09-08 16:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6c3d35f5471e5d2992637bb9e6482078 SHA-1: 8ca24f24ba4b8686edec75dd9084547318ab155a SHA-256: fb8fae36aa04195623c30650a5040442055c889f9a9e3ad76a3066b0b8e95597
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to decrypt a password-protected archive, a common tactic to evade gateway security scanners.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=conversion+du+word+en+pdf+en+ligne PDF link annotation
    • https://haruhonpo.com/upload/haruhonpo/files/22749737400.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/82572506393.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/40770040849.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/nugajatez.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/boxasirisukizejaserom.pdfIn PDF document text
    • https://estoniapools.com/contents/files/gofodorevewuz.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/79042549039.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/8f8142ee9f7707d8e8a0197df3032ce4/nenuf.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/sugevuvudemozoj.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/77035867898.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/30527866872.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gisenumi.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/6854831302.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/82058851309.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/simapelogipun.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/bujuzenobonamezu.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mukoxewolufusokojexiwalaz.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/piwogipifu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/ruketofitadisaxinabamefoz.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/82834047081.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/ripazimaboletaga.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/6a4613a5848d3b612c0c88aab0c5fc2d/90852205930.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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 19904 bytes
SHA-256: 902131a26402ba866ba78055a118dcef52574d645fe6189e0edaeced11f9c94b
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 10696 bytes
SHA-256: 6527beb0ff887209170084bd60518828bf6ea8b9eab9d5403f4fd139244bc812
font_02_sfnt_off0001202c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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