Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcabf6b007c04135…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 20:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 24028c7aa46912d8629185428382cfc2 SHA-1: 0cd7663105bf521fa59961ccb635c9c12eb76c48 SHA-256: dcabf6b007c0413590f00ca226b2572c5426176a8332823bcf1f8c0e2fb090d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggesting a phishing or redirection attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm on disposable hosting, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://testpensija.bankai.lv/ckfinder/userfiles/files/lezikadomavitukotegipif.pdf In PDF document text
    • http://hidramaco.com/files/files/72662540724.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/71759705531.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/41410418579.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/19303774426.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/82466487006.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/70233078743.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/98915442286.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/71960101166.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/41868202094.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/29771260277.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/wipubusobawabawid.pdfIn PDF document text
    • https://vendax.ro/files/file/40279520168.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jixominagotaf.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/posafejavo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/88689060355.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/70528194361.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwusirinaretemeviveja.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/zobaperuvululibekun.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/ligagigenoboraza.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/relifekanuzuzusid.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96d0a5b95---39069433807.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/45017348658.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/pumaliweziritovotewinoru.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/bofumilotinajugidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=rocket+league+sideswipe+appPDF 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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 18412 bytes
SHA-256: c94f180fa3457eecdb00a16a0cab3b600cd11a6cc1835901e5a82be9b5cbd1c1
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 10808 bytes
SHA-256: 749fa6a694d5d691f1b82354d3846f6cb0befa31a94e6b173fb5349b778d3469