Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6b55a5c271fdac…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 19:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 179c901b94d5335b365501ac64391c68 SHA-1: 3622164b9977df50dab2995b6dd9de584bd82ad1 SHA-256: 9c6b55a5c271fdac6e86b3eedbadf527a8e4c216d7bf8a50cdcfbecd10a135c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and numerous extracted URLs suggest the document functions as a link farm, likely directing users to phishing sites or further malware. No scripts were extracted from this sample, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://ng-sons.com/userfiles/file/96011189670.pdf In PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rigorixupivunuda.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/36641016677.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161417225b8574---subime.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/fuvureg.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/darolosuluzerebopi.pdfIn PDF document text
    • http://faradbox.pl/files/file/15566415804.pdfIn PDF document text
    • http://cartopack.be/Images/file/90542864513.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/vekajutusosuvuxop.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/11128067769.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/74560422948.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/semafoxiniwunabupa.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/33809426542.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614118aa6d16b---nawugibepokevudixof.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/simovekodufufotaxokajuzon.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/lofezifarulifizimilatuga.pdfIn PDF document text
    • http://minhanh.com/files/lomafiwebatajatumupepinu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/36800086913.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/64138760326.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/folepufatapegalefipu.pdfIn PDF document text
    • http://xhzhengli.com/upload/49697172699.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/85283097739.pdfIn PDF document text
    • http://nincity.de/inline/file/54776739386.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/rafukugopokopugem.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/rowoxulivudozatireti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+suicide+squad+2016+online+freePDF link annotation
    • 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_off0000dc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4E 11276 bytes
SHA-256: 3fd4036fa4a0063855a6f9f55e87155e368798470931955e62c1fbc8b01ff91d
font_01_sfnt_off0000f69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 19308 bytes
SHA-256: 97f30e9ae3aef72facb834d52f3589f6cd3f269fd13be3651bac9daf74f1eb6e
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1