Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85090e072e2744d…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 11:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c5994798b84ce8160307c4c92bc6cf2 SHA-1: d4657105deec7b81f5a3264961d19c3048c510a5 SHA-256: d85090e072e2744d47c40bac5d0af53b25fbf8b6b3176f7be6fa652eadb340a4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, flagged by heuristics as malicious, which is a common technique for downloading and executing further malicious content. The presence of a link farm with numerous disposable hosts suggests an attempt to obscure the ultimate payload delivery URL. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nmcs.ca/userfiles/files/bulur.pdf In PDF document text
    • https://promaxsuspension.com/csmimage/file/wibizamugamejonigutarazar.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/44601955964.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/wulafuvamesuduvexesaxi.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/4963353245.pdfIn PDF document text
    • https://matricula.arendic.cl/files/69174476651.pdfIn PDF document text
    • https://unaizahic.com/Files/files/febedikexodeduba.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/zajakufoko.pdfIn PDF document text
    • https://servauto.fr/img/user/file/6130879909.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/rabajakedulitadegen.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/xexoxesegamawonadol.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/nixexapo.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vabilazimowuv.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/14683047387.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161317c199242d---larudurofod.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/sofuzibutum.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/vegigupeji.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/kalabazunorapebotaluxekab.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/28490297928.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/fudanajib.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/28388546103.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5321145c1---51036895146.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/batoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=play+kim+kardashian+hollywood+onlinePDF 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_off0000b93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 16464 bytes
SHA-256: 7f9707acd7010bdd73293ca6e3b3903f32bac62bd389cc9567d4e397526fa3c9
font_01_sfnt_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 10708 bytes
SHA-256: 40d9ce6ab2dc4451f24a00b4f0f233d691c14388ac97f19986d8c94f7d344db0