Malicious PDF — malware analysis report

Static analysis result for SHA-256 8155914b535fc1ef…

MALICIOUS

PDF

43.1 KB Created: 2020-03-22 13:37:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 253b30638132b95b2805e8f2c0f1deae SHA-1: c687f719947928e0d6c2e1e28ec8f7821a13c2e0 SHA-256: 8155914b535fc1efd0b730fdb444ed196477e3dc2a019ec55a19f97ca432242b
96 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links to external PDF files, a technique often used for SEO manipulation or to host malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users or host further malicious content. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

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://thegemstonegirls.com/uploads/1/3/0/3/130323154/130323154.html#mercury+110+9.8+parts
    • http://parkervoice.com/uploads/1/3/0/5/130543020/d0f8adb.pdf
    • http://naturesfarmaceuticals.com/uploads/1/3/0/5/130551625/zabulikokudemo.pdf
    • http://www.thebestyou.xyz/uploads/1/3/0/4/130435509/basepofowofa.pdf
    • http://mail.lonsdale-estate.co.uk/uploads/1/3/0/7/130775150/fobipagexemuxuj.pdf
    • http://www.pupoforkids.com/uploads/1/3/0/6/130639157/cb4a0ae70b93.pdf
    • http://hostmaster.servivangrinsven.nl/uploads/1/3/1/0/131069950/taxejukevi.pdf
    • http://ofa-ko.org/uploads/1/3/0/4/130489175/4724914.pdf
    • http://pressburg-partners.com/uploads/1/3/0/7/130740504/3174a79.pdf
    • http://dartplayersmiddleeast.com/uploads/1/3/0/6/130639635/3fc2a9.pdf
    • http://mail.frothcoffeeco.com/uploads/1/3/0/2/130272573/rirudawedoxuneg.pdf
    • http://comphysics.com/uploads/1/3/0/6/130639203/900bec.pdf
    • http://etplaouar.net/uploads/1/3/0/7/130775402/43a9f.pdf
    • http://vessol.com/uploads/1/3/0/9/130969541/nasajelesajelefutik.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_off00007fa2.bin
fe10d77b7623d8232a1aecdf61f39c5f4e657d6676a34253e81c29fb717dbea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA2 8332 bytes

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