Malicious PDF — malware analysis report

Static analysis result for SHA-256 7685cd0c7e46129a…

MALICIOUS

PDF

38.2 KB Created: 2020-03-11 06:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 31c386ba02b8199dcdf8cbdeafaf94e3 SHA-1: f590e5bb23f20170620b93a29d8ada4d8d9f0852 SHA-256: 7685cd0c7e46129a058de38868b190b25c780b2425fb895906c22b58961921da
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity, likely serving as a distribution point for other threats.

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://hostmaster.walkingtonpreschool.org/uploads/1/3/0/4/130476204/130476204.html#bialetti+manual+grinder+review
    • http://afh-tarika.com/uploads/1/3/0/6/130620399/zotojovubavelozon.pdf
    • http://precisionhomeinspectorsfl.com/uploads/1/3/0/6/130604402/refotuweb_guwejewenadudi.pdf
    • http://unidacers.store/uploads/1/3/0/9/130968934/xuporabudemolixoze.pdf
    • http://mta-sts.mail.raftracottageholidays.com/uploads/1/3/0/7/130739377/5685809.pdf
    • http://mail.herbstoknow.com/uploads/1/3/0/3/130313427/dutujogaxomebusi.pdf
    • http://inlineuniversity.com/uploads/1/3/0/7/130776886/fewosusilaxik.pdf
    • http://northwestkansas.net/uploads/1/3/0/5/130588894/af696e37.pdf
    • http://www.connorcostanzo.com/uploads/1/3/0/3/130379407/nuripuboza-voditelis-fabexeteg.pdf
    • http://freesiteforum.com/uploads/1/3/0/4/130488069/dupuvefureg-dodasiledo.pdf
    • http://nahomiichino.com/uploads/1/3/0/6/130620736/juxagon.pdf
    • http://drealy.com/uploads/1/3/1/0/131071067/denetagisa_wagadesisevol_dufuxapanemev.pdf
    • http://aikotanaka.com/uploads/1/3/0/6/130620848/6a556bc2.pdf
    • http://centrocristianogetsemani.com/uploads/1/3/0/4/130488067/a57a9f2.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_off00006c18.bin
08c9776adc410f760150a3379668272d11f089f0b43c69e37023b9aaea7f931b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C18 8272 bytes

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