Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fdf3162e511eb8c…

MALICIOUS

PDF

81.9 KB Created: 2021-10-16 15:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d016d00b88c3b0b7d2b02a4dea81a52 SHA-1: e9f26c15a062f4f3766b4c39af81faa4cb69b3d8 SHA-256: 0fdf3162e511eb8c7deef6fc747d6a785f55f992f53ea32805ef78a9e16315fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to numerous external PDF files. The presence of embedded URLs and the PDF structure suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the overall pattern points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://hotelharmika.com/assets/userfiles/files/datukozinusasawu.pdf In PDF document text
    • http://evrokomplekt.ru/userfiles/file/21208848086.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd242468bf---jujipasunosepagupone.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/rojemozijefax.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/vavuz.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/wazukuwudewoj.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/koturelunusuja.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/030556161949.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/32788086593.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/87812344522.pdfIn PDF document text
    • http://anpharma.net/upload/files/liwupukixep.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/68242085847.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/pumogusebajapenarox.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/58558134349.pdfIn PDF document text
    • http://mextro.de/upload/files/2600948749.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210917042911.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/6652226666.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/bakonibo.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/nivadenutubam.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/55303021398.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fab252ecb3---lelexozufomuk.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=certainly+meaning+in+tagalogPDF 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_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 10428 bytes
SHA-256: 7c066d1d8d5cc8f88f607729cf72bac953fa691cf29eb93d7105bcfd870f9529
font_01_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 19712 bytes
SHA-256: 39957bdc3e46e245d970448117ea9606126bcd857bad60c3cd6fe19adb7c4282

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