Malicious PDF — malware analysis report

Static analysis result for SHA-256 f554e2d52943f8e4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 17:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: be364aa855b782b7e4cfcf2ef77fd25c SHA-1: 78d20054ea2391a131fb9f6fa4b89fe4eec75d33 SHA-256: f554e2d52943f8e4c750ec23c55d65f50bc0e32837d094aaa4f5a1701873f4b9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely for SEO manipulation or to distribute further malware. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 http://gtlfuelmarine.com/userfiles/file/6780306699.pdf In PDF document text
    • http://darec.sk/files/files/leviberiji.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/58404381634.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/wugapizipimebukigi.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/66679153020.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/41764340361.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/17230301620.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/94839389866.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/29016164560.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7e3dca48---xenexitatubonagimijivo.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/fewemusufiv.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/94155878499.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/biduda.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/zajakolubeb.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/basapimadoponafukom.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/63274217839.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/laganifisakubo.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/46154480629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+stuff+in+pokemon+goPDF 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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 17820 bytes
SHA-256: fddbcf9420fb26b97a53b3db0ab3372febe660d69b81ccf00ad28ba190d05441
font_01_sfnt_off000103c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10664 bytes
SHA-256: 6700d06fe4feb06f2faebc54b11b74b2680328403b8046200b34f5282cc0be2c

Open this report in the interactive analyzer, or submit your own file for analysis.