Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92bcdbb3713e7f7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 07:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3348f59a2c3365547b60702f5fe2e2c0 SHA-1: b853abdf8be79f66b39f7af1cbdf27b40af37820 SHA-256: c92bcdbb3713e7f7dcc5de2fd7ba1fc5c64cac0108e82edabf7cc5599bfa4d7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=can+i+haul+a+refrigerator+on+its+side PDF link annotation
    • http://mrpennarak.com/user_file/file/derexujidibel.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/nuwoxutalodijuwap.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/26633526031.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/fefowufirimavulejem.pdfIn PDF document text
    • http://grupophi.es/uploads/files/tirerezubipiwunaketulof.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/sovurijuxijepenodikuk.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/34118203840.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/40edb7205e57334bdce195c1cbabed03/16629773456.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/bujuresejaxapitedoful.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090422381932810.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/6067173711.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zulumilifufej.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/82200176834.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/luvivegudegodij.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/powodidito.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/34639782745.pdfIn PDF document text
    • http://sgpeo.pl/users/file/81679581614.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/xapabiwapawarobodijifakip.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/70453500353.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef16252c5b---99577947075.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/refeniwumisejatol.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/88468947955.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_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 16440 bytes
SHA-256: 6fd7356314e58e7365b6e8d5845a76a87671f58ef8945abfdbd7157d4522d191
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10764 bytes
SHA-256: 048fc06b6cb0ba18496d491a8a2e61b937c1c4c6d01c4d0db73dced65aaa5879

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