Malicious PDF — malware analysis report

Static analysis result for SHA-256 038a934cea4e319e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 06:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cfa6049f84c4d31adf0ca88087a9bd4 SHA-1: 43f8818caa3c43322f21a94bdf4728c43a4f9b5a SHA-256: 038a934cea4e319e05f9cc52441147812481e56ea78142e539d0f3044123d087
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The PDF structure suggests it acts as a link farm, directing users to numerous disposable domains, a common tactic for phishing or distributing further malware. The presence of embedded JavaScript further supports malicious intent, likely to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://coretry.ru/uplcv?utm_term=jetpack+compose+spinner PDF link annotation
    • http://marthomaiticherukole.com/userfiles/file/pugukikubuxadupifoz.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/fodokuxego.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/finimapop.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/pezuba.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/ritixiteribemakugawamer.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/karipaxijekoxaji.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zotujifelunetanipavazuza.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/92716461447.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/99936972568.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/35667763921.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613849a4a8a85---19522564353.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/wazowototukinovije.pdfIn PDF document text
    • https://salwangurugram.com/files/42631413437.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/ligexanadiwupa.pdfIn PDF document text
    • https://ratosatu.com/contents/files/90376982356.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/rigop.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613292bf3535c---89718198174.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/76804148688.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rijideranuwovezij.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/ralapa.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/mawefivixof.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 10572 bytes
SHA-256: 6dbcd35f623c9dcdcaa0b5d92326f62531e5f3323c6eb2df4629998eee765d53
font_02_sfnt_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 18964 bytes
SHA-256: 7689220cf669da783d0558595e5dda74b0b75cd117645005c57a29460fa76736

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