Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f39d1d32611c2f…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 10:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cffc90aeb9ae32bcc930fb51a62ce737 SHA-1: a3a58a734bd91683da5bf7759248fcb0a6d9d8c1 SHA-256: a5f39d1d32611c2ff53b11c208b349e5a8763f5be260e452117394c628bf57f5
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=cloud+pc+apk PDF link annotation
    • https://fishboat.hr/files/mopubawejiwebox.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/mizowedilajizeri.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109070522135401.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/28183850031.pdfIn PDF document text
    • http://precisao.net/files/files/zudodesevivavixu.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/dupitamowadefupo.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091107534816.pdfIn PDF document text
    • http://soc-in.com/data/media/files/26121328144.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/vijako.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/durivizapitibo.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/57205947638.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/19350015351.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219111116556444.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/badegegafis.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/sogusutanus.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/51106964680.pdfIn PDF document text
    • http://steinemann-ag.ru/21465793330.pdfIn PDF document text
    • http://compsult.net/userfiles/file/71573099175.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/50057347312.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/8138806768.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0kt6ok64thbpp4gh25mk9fdq9v/soselaridiseteruziluz.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/86214116272.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/60867100918.pdfIn PDF document text
    • https://equinox-e.com/upload/files/30040639766.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_off0000c671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC671 18104 bytes
SHA-256: c03073d082b113e754b3be7b7acd64e4ffc1bb150de8b2389b8711295a72f32e
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 10036 bytes
SHA-256: f61eab2776ad26e71f37b2dd8da56ce1b449c5dbd6f90a2d1c9f5061daa9ee2e

Open this report in the interactive analyzer, or submit your own file for analysis.