Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e06c8bc59c4a587…

MALICIOUS

PDF

46.8 KB Created: 2020-04-07 18:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd921d97be145d6efd8e7d0831a976f6 SHA-1: 1c4a26e8a6a7172e6a9ec38b292deea5927fc745 SHA-256: 1e06c8bc59c4a5875721a0c874310415915f9a5f2896d243e4ddbd939ed5d118
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to other PDF files hosted on unrelated domains. This behavior is indicative of a link farm or a phishing campaign designed to distribute malicious content or harvest credentials. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://sauerlandhypotheek.nl/uploads/1/3/0/4/130488503/130488503.html#scholar+class+quests
    • http://cdmla.com/uploads/1/3/0/2/130288441/nurivutiwe-zikepufifasoj.pdf
    • http://narrowbanding4you.com/uploads/1/3/0/4/130476804/9960678.pdf
    • http://crosspar.net/uploads/1/3/0/4/130435745/5285159.pdf
    • http://bviico.com/uploads/1/3/0/6/130639553/5831522.pdf
    • http://calltostory.net/uploads/1/3/0/9/130969266/lolipatalurax.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c9d.bin
d2f659034c9569a6bea68a167326170640cb42ea5e3cf27e71cd6d554388510f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9D 7508 bytes
font_01_sfnt_off000099cd.bin
2f79ba52acca039e5c354f09c372eb8b3e5c303dfc88b98fa2ec462876c681ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99CD 16160 bytes

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