Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ef02f6dc23588c…

MALICIOUS

PDF

81.5 KB Created: 2021-10-12 01:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dcab97121bb5315ced71ee5cfc32ccc8 SHA-1: b15ad45c69bf38c78e4c43d835eed76c6ab6bedd SHA-256: 38ef02f6dc23588c46b84fe6e8eca8c11a0c783ea252877124b123940f262c32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=how+to+thaw+salmon+quickly', likely lead to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/uplcv?utm_term=how+to+thaw+salmon+quickly PDF link annotation
    • http://studio70.eu/userfiles/files/69426118615.pdfIn PDF document text
    • https://web-dev.ethioapp.com/websites/lightyearsahead/code/userfiles/files/nowijewezubite.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/18958706155.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/manedalufilavenofobupif.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/dotepalawexafiwobidosal.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/6112312417.pdfIn PDF document text
    • https://guijek.com/userfiles/file/mefixabozozutedez.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/58660789558.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/87279879576.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/79339198569.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c26ff62229---mafelogov.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/39916555015.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/99935388137.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/dapifadasagekematawened.pdfIn PDF document text
    • http://3m18.com/images/editor/files/88944112503.pdfIn PDF document text
    • https://ubranni.com/uploader/files/jokajurijowax.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1d498b87a---puzisaveliwukurifigukuxus.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092222281690.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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10792 bytes
SHA-256: a3fc9ab3083a5a1562d68e685c61c042345daf8f206308164e01f59b8a78298d
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 18704 bytes
SHA-256: a6b67232ad299146c42c1e42e1711099c80664e669f453b29e3ebe3aa1fc3a02

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