Malicious PDF — malware analysis report

Static analysis result for SHA-256 99343eb8be0118d5…

MALICIOUS

PDF

43.4 KB Created: 2020-04-10 15:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 271902d369199b1eeeb682332aa57efb SHA-1: d0f5acdb82556b9641109b5e5735bee9adaa59da SHA-256: 99343eb8be0118d5de561b2e2e8323ab8e905a9f07717254b1c3da6191382846
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to direct users to malicious sites. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that is also present in the list of extracted URLs, suggesting a deliberate attempt to redirect the user.

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://pragueprivatetransfers.com/uploads/1/3/0/8/130874433/130874433.html#is+your+girl+booty+flat+song
    • http://martinezpinestraw.com/uploads/1/3/0/2/130272432/6822922.pdf
    • http://sachsfoundationinc.com/uploads/1/3/0/2/130287495/bazag.pdf
    • http://rumbleandgroove.com/uploads/1/3/0/6/130604682/2146938.pdf
    • http://mchusky.com/uploads/1/3/0/2/130272327/xugez.pdf
    • http://governmentwholesale.net/uploads/1/3/0/4/130477192/80b13.pdf
    • http://excapatetravel.com/uploads/1/3/1/3/131383533/dibufusibagi.pdf
    • http://theremeproject.com/uploads/1/3/1/4/131452817/rinewu-zijosulibife.pdf
    • http://aueservice.com/uploads/1/3/1/4/131453405/8546160.pdf
    • http://pandeliventures.com/uploads/1/3/1/0/131071277/4a308beea.pdf
    • http://spangolia.com/uploads/1/3/0/7/130775214/nuzajisuj.pdf
    • http://urih-art.com/uploads/1/3/0/6/130620796/7819479.pdf
    • http://kimgustafson.net/uploads/1/3/0/4/130488312/rigex.pdf
    • http://gresham-carpet-cleaning.com/uploads/1/3/0/6/130639311/xipamevilovezisonif.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_off000080f6.bin
ec2227f28e503e71ae67ec0af3a848aa277456b9883b0ac0699054e99bc7de3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80F6 8192 bytes

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