Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dfd9c1c503f2b9…

MALICIOUS

PDF

38.0 KB Created: 2020-04-03 08:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15511c49c7a855fbe7ec07825a9d1cf4 SHA-1: e8f25b61da19f9ab21036ae3d0601ff6289c6841 SHA-256: 19dfd9c1c503f2b997245c9e7a75031d5a7a5a156e0c725139dab41eefbbaf40
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text related to medical procedures and the authoring application, but the primary malicious activity appears to be the mass distribution of links to other PDF files hosted on various domains, likely for SEO spam or to distribute further malicious content.

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://bouncehouserentalshuntsville.com/uploads/1/3/1/3/131383743/131383743.html#exploracion+de+mama+procedimiento
    • http://register.aerodromes.com/uploads/1/3/0/6/130604247/xafarixagi-rerabokosi.pdf
    • http://anuqa.net/uploads/1/3/0/5/130588780/ceba904fa2.pdf
    • http://myelitestaffinggroup.com/uploads/1/3/0/6/130620602/zoredusumogazez.pdf
    • http://acreggconsulting.com/uploads/1/3/0/5/130547142/ponajifajovoruzug.pdf
    • http://nolimitsrunning.org/uploads/1/3/0/2/130291689/futob_memakuzete_dupufamuz.pdf
    • http://cannabisemail.com/uploads/1/3/1/3/131384656/gazigorufalotul.pdf
    • http://bigpond.shop/uploads/1/3/0/9/130969114/33f22268e993dce.pdf
    • http://vardarholdings.com/uploads/1/3/0/3/130313293/095c6cbadb54.pdf
    • http://3095702.xyz/uploads/1/3/1/4/131437503/1454130.pdf
    • http://parkerpurchasingpower.com/uploads/1/3/0/7/130739693/1dc98ecd596fec.pdf
    • http://jfhaderillc.com/uploads/1/3/0/6/130620942/tezufogoxevasibinux.pdf
    • http://blocktalent.com/uploads/1/3/0/3/130379210/7245615.pdf
    • http://groupelmpinc.com/uploads/1/3/1/3/131381435/xirob-batadawo-gujuxexe-jumifew.pdf
    • http://williams-corp.com/uploads/1/3/0/9/130969974/c4f6130.pdf
    • http://mainlymassage.net/uploads/1/3/0/4/130488786/0c207e.pdf
    • http://katherinekportfolio.com/uploads/1/3/0/9/130969862/2a78de67cb58.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_off00006bef.bin
0d849fea23e891e3a6ff4619f244340b7a1970aba4ff5cd918f5a52ac732f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEF 7936 bytes

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