Malicious PDF — malware analysis report

Static analysis result for SHA-256 35736c96ee115943…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 08:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 80fb59474887776fec9cd84113214ec5 SHA-1: a13a256d3613026be133b71a626a6d505fee5261 SHA-256: 35736c96ee115943093d714547256df3106d9eb84766c40b1325254f0527322e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable, suggesting a link farm intended to host phishing content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links across many low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://reicar.dk/userfiles/file/xubumanunim.pdf In PDF document text
    • http://khachsansapa.vn/webroot/img/files/zakefoburetunaleto.pdfIn PDF document text
    • http://vhktn.at/images/content/files/60915852139.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/fuvojonuwusinubumepofer.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/69253600012.pdfIn PDF document text
    • https://ms02bet.com/contents/files/11431374112.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/63124010753.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/mosekivapasirora.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jaxesetutudofif.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/65288300664.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/91856841821.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/66093427997.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/lebiladigalifipa.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/10125781353.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/nafuforesusesenitule.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zevujobufudirozozojogov.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/75038711598.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/mogalojorakatunobotunit.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/wutuvumajuzu.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/86598379666.pdfIn PDF document text
    • http://prmakeup.com/Image/files/pejuxetexuxu.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/98969067768.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/99061175552.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/napukozisi.pdfIn PDF document text
    • https://birotex.rs/images/files/mupumezebalilokufabifu.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86f37cdde---netudom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+should+i+eat+in+the+morning+before+workoutPDF 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_off0000bb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 15040 bytes
SHA-256: d9d025b53b92ed8dbca453e32a5d70ae1f15b38975fba2e1d42b874d32517039
font_02_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 11212 bytes
SHA-256: 328263e5a740a5c662e2196ae65177638971fd75f0ed612b6a206c614182ccde