Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb71daa59efd8590…

MALICIOUS

PDF

41.1 KB Created: 2020-11-07 23:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acc20f7b574dae8266be64d37bb71670 SHA-1: 16997170b3f5f31646d93908014bf6bd6ab6f264 SHA-256: eb71daa59efd85903bcdf7c464acffdd7eb03536b3eec61b10f5832647bc031a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to WordPress-hosted PDFs, suggesting a link farm for SEO manipulation. One of the embedded URLs, 'https://trafftec.ru/123?keyword=mrs+dubose+in+tkam+addiction', is flagged as malicious. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/123?keyword=mrs+dubose+in+tkam+addiction
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://waroxepala.files.wordpress.com/2020/11/wawoladiwep.pdf
    • https://wejogude.files.wordpress.com/2020/11/niwasegini.pdf
    • https://nofagixonuva.files.wordpress.com/2020/11/76944399871.pdf
    • https://gudovukon.files.wordpress.com/2020/11/49618254741.pdf
    • https://zerujad.files.wordpress.com/2020/11/45647870492.pdf
    • https://s3.amazonaws.com/jepavilutabilel/chemistry_formulas_in_hindi.pdf
    • https://tefijum.files.wordpress.com/2020/11/unnamed-file.pdf
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdf
    • https://tevarew.files.wordpress.com/2020/11/88608638079.pdf
    • https://ripigewub.files.wordpress.com/2020/11/ditukalabekorutasekavoj.pdf
    • https://uploads.strikinglycdn.com/files/d2d29d4e-448f-46b3-aaaf-7e1630587da1/93405963959.pdf
    • https://kagovonokud.files.wordpress.com/2020/11/dekazuxomizugufowedu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060a3.bin
860ff9a0f4313b2e952de4c3a4034ef5a794f140d65b4b660f1b265f0253d37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A3 5264 bytes
font_01_sfnt_off00007279.bin
674f395991c4059e110a58e9da4dc3a80f9ecb4a12af5baf6b8313b5efbbeebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7279 11372 bytes

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