Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d817be4e9fd62bb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-23 19:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19074ba55b24beb1f599b6386765e1c4 SHA-1: ef86ad263b8073eb315524999ee84930edccc9c9 SHA-256: 8d817be4e9fd62bb4e6eb8525f8900d887a5d950286cba88d55620bdfa6f2ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. While no scripts were extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://glassick.com/userfiles/file/kisugo.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e315ceeb2bed97b976b9a3df5dd78927/suxekafowuzelivinoke.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/29378244115.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c924d54a1b---48248182232.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/24698562841.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/93333266672.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/81212215629.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/71949827864.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/vizogivowenizir.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/69082454160.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/gopatidofopegetojetuj.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/noloxipidotumejajurujar.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/vafurojafalasogitesuzawa.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/41212278302.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/99461882710.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/19591950939.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/dajubapekitalixa.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///2878752429.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///88633162824.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/nujodigaponojene.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/78480905638.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/95232728451.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/58020247857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=send+videos+from+android+to+iphonePDF 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_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 17688 bytes
SHA-256: da6ce74dbf928601167f755793d3aa9f46b86c2685067f39922870d69b49aa3e
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 10856 bytes
SHA-256: be83d1a412486e917c528bd7850463d8dd2711312edc2bf8bc520436285aff40