Malicious PDF — malware analysis report

Static analysis result for SHA-256 57001968db594427…

MALICIOUS

PDF

44.4 KB Created: 2020-03-22 10:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef3ad93a41aa8b526503125e3d9d061b SHA-1: b9afaddac5d87bed49b7dec6cf30565540dd10f8 SHA-256: 57001968db59442774b51991bd9e83ecb0555445d56ff8d7b131eb8eff5c5b07
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://wagenselleryoga.com/uploads/1/3/0/7/130740169/130740169.html#ter%C3%A7o+da+misericordia+em+pdf
    • http://kindredphr.io/uploads/1/3/0/8/130874219/wititavivom.pdf
    • http://menongoldstein.com/uploads/1/3/0/6/130604036/110978.pdf
    • http://proceduralpixel.net/uploads/1/3/0/6/130621470/ab72914.pdf
    • http://www.leucemie-myeloide-chronique.com/uploads/1/3/0/7/130740110/1112e3f95d956df.pdf
    • http://litemann.com/uploads/1/3/1/0/131070442/1740974.pdf
    • http://martyking.net/uploads/1/3/0/7/130739686/18aaec9e8cdf286.pdf
    • http://74-123-72-89.mgwnet.com/uploads/1/3/0/6/130640107/bebadibovimaxo.pdf
    • http://www.slayannasboutique.com/uploads/1/3/0/7/130775498/xigen.pdf
    • http://mail.st-hilary.com/uploads/1/3/0/8/130814687/bewapa_gaxuxaku.pdf
    • http://costaricawomensherbalconference.com/uploads/1/3/0/7/130775646/a32e5b376.pdf
    • http://adsl-66-121-174-45.encorp.net/uploads/1/3/0/7/130740266/juwosamugutube.pdf
    • http://www.runwildandbe.com/uploads/1/3/0/2/130289694/lelepi-mifapuxibun-palupupoduwat.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_off00008029.bin
cf461a00860712b7bd451e7aa6ad3b4404319758b1506335c4c0518f162ae5ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8029 10676 bytes

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