Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6502251c724fc2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 21:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edac0493a074ab59480738eeea0487fe SHA-1: 5263f59722b02733f715bf32902115f745a8ec22 SHA-256: bd6502251c724fc24d60e812ad0e8911a42067874c9cd79274910274e6728624
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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 domains or are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF_URI heuristic specifically identified a URL that appears to be a redirector with a UTM term, further supporting the phishing lure hypothesis.

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://wastran.ru/uplcv?utm_term=phone+mode+chrome PDF link annotation
    • https://htchninc.com/d/files/rojevifisiguto.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///refalakitebovibofafek.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317bda38411---93917440234.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/71397357552.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/27793547916.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913034620_gmshh0.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/31737657350.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/25940205257.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/86048971110.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/77192022267.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/81383266556.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/74625250402.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/15137194562.pdfIn PDF document text
    • http://gazetavk.ru/img/file/nobakadifizebovokiwetiw.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/sutesutix.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/jalizitebenamupufixo.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/6133514048.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c936bd1ee9---38899890995.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/lifed.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/5712711241.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210903003850_rf0cxr.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/35948541282.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/64519365074.pdfIn PDF document text
    • http://twilaw.com/files/files/bogigeregasirakelud.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/dadepegufabudawuze.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_off0000dc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 10068 bytes
SHA-256: bb0baa82180acda4878137977585a8176026b700f949d598959bc01d5ec17b4f
font_02_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 18148 bytes
SHA-256: ffea822e41b83a4b1a7be3ac6a8dec28dbc1ee4d07eee2c7966809d999d82151

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