Malicious PDF — malware analysis report

Static analysis result for SHA-256 341eb5eef7ba6239…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 10:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: faa8a5c432d5dd56cd0287b8cbec1928 SHA-1: 879c3aaf55d4f0db1a19b25cf49744effbc0024b SHA-256: 341eb5eef7ba6239a715652d657196c0cb9f4f905b1b0faaee2cf89d4de2882b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the PDF is part of a scheme to drive traffic to low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=apps+like+pixaloop+but+free PDF link annotation
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/pedirulusodivoreku.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/89608669354.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/50265361966.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/zitesojun.pdfIn PDF document text
    • http://ort168.com/upload/ckeditor/files/xusiruxekedasawofapiweto.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/kolomozozuvapob.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/doronewulubeputujiwajupav.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/sixaponopubesorumexu.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/belomoropixuwojezi.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/67678551673.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/17997494609.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139640873683---84113569022.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xojuku.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/dumanifijakufetug.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/dawujibajenemelivobo.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mulanow.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/firokutewexidorakekurufi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/ruzemunonoxiwomumenusagab.pdfIn PDF document text
    • https://e-midas.ro/files/file/92712787466.pdfIn PDF document text
    • http://195exim.com/datas/files/65842309411.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/50250573413e439ad6e6083170313e9b/2132100212.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///momitopu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 17596 bytes
SHA-256: c3f09d4181c740c580f71b206d87bcc4bd67e3226210426261c39dc7994111af
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 10660 bytes
SHA-256: 41d53ed346ca1c3e0cf23ccc2573b9d136e84aa486a90a965bd56541930d2d03

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