Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a19b6691854c0e…

MALICIOUS

PDF

40.4 KB Created: 2020-06-02 00:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f554d8ef0ec198068a1fcfd2af08905 SHA-1: d226d915bbe46ef9d0768e9e240b6243fcce9825 SHA-256: 09a19b6691854c0ed107231e29289f574d95edc77744aa534ad071bc6b96f5f0
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links point towards a spearphishing attachment or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://blackkkkkk.com/uploads/1/3/0/5/130588484/130588484.html#canon+600d+t3i
    • http://colorsforcubatikkumolamkids.com/uploads/1/3/1/3/131380592/dizulod.pdf
    • http://hotshotshorts.com/uploads/1/3/0/2/130289427/0c5e500cb.pdf
    • http://thecajunladies.com/uploads/1/3/0/5/130539597/paduletasasagase.pdf
    • http://webdisk.sayezz.com/uploads/1/3/0/6/130604516/nuton-fudedefuzuwojew-tegosuxeposi-vivejo.pdf
    • http://blackkkkkk.com/uploads/1/3/0/5/130588484/terms.html
    • http://blackkkkkk.com/uploads/1/3/0/5/130588484/dmca.html
    • http://blackkkkkk.com/uploads/1/3/0/5/130588484/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bitepon.files.wordpress.com/2020/05/33342054372.pdf
    • https://tapimen.files.wordpress.com/2020/06/71564576337.pdf
    • https://dameniv.files.wordpress.com/2020/05/nituzetebosenaxidewolazu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072e9.bin
02a8a3eeddde5d7288a6aea5de5d0c25315c505263dab2c233116bc628331186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E9 10536 bytes

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