Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4de0c6329a5ac9…

MALICIOUS

PDF

41.5 KB Created: 2020-04-02 23:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 801c303de5d565f06585388c093b1b39 SHA-1: 1f6a35d8ad8a4e09e6954a8a3cfc0d8c4242a9c3 SHA-256: 0c4de0c6329a5ac9e102a5ac0df138d928c0f9a9c3f30e46f96d35b16363b855
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. While no scripts were explicitly extracted, the PDF structure and the sheer volume of external links suggest an attempt to redirect the user to potentially harmful content, possibly for SEO poisoning or to host malware. The ML classifier also strongly flagged this PDF as malicious.

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 http://alcinemaksa.com/uploads/1/3/1/4/131407424/131407424.html#xenon+atomic+radius
    • http://meeeem.com/uploads/1/3/0/7/130739567/23e39.pdf
    • http://drpupperz.com/uploads/1/3/0/7/130776340/4eb9131486700d6.pdf
    • http://treatsforlifefl.com/uploads/1/3/1/1/131164038/gedasud.pdf
    • http://amansprocoatings.com/uploads/1/3/0/6/130621890/bd5208cc4dfd4.pdf
    • http://fiftycentfantasy.com/uploads/1/3/0/9/130969419/naligolunujigido.pdf
    • http://heavenlyinhomecare.com/uploads/1/3/0/6/130621776/b7db5d70677299.pdf
    • http://fairbanksplaceapartments.com/uploads/1/3/0/6/130604028/a15415.pdf
    • http://reedertranslation.com/uploads/1/3/0/5/130543346/9741487.pdf
    • http://bowyerlegacyfoundation.com/uploads/1/3/0/3/130323547/63ed0b8c42341.pdf
    • http://alexandralewisphotography.com/uploads/1/3/0/8/130874240/585667.pdf
    • http://onlinehealtharticles.net/uploads/1/3/0/7/130775985/5913049.pdf
    • http://liladorned.com/uploads/1/3/0/7/130738936/wifutotifige.pdf
    • http://nsideoutboutique.com/uploads/1/3/0/5/130588740/a32d33c.pdf
    • http://thebreathingbody.com/uploads/1/3/0/8/130815095/tadalaki.pdf
    • http://sxull.net/uploads/1/3/1/1/131164159/wulixeka.pdf
    • http://riverratkreations.com/uploads/1/3/0/6/130604549/kiguzax.pdf
    • http://greenteamgardener.com/uploads/1/3/0/2/130289375/9ac5ea.pdf
    • http://supernovapinball.net/uploads/1/3/1/4/131454102/4289b.pdf
    • http://mta-sts.mail.micahchristian.org/uploads/1/3/0/5/130544091/vomugotitinom-laganul-labige-rakuzururefojan.pdf
    • http://chiroaustralia.com/uploads/1/3/0/7/130740444/18a7c1bbc5b.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007978.bin
042c79c0aad07bc99a51a49c03a06b6c42f1e6015ff9fc242ae1f0788f375ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7978 8176 bytes

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