Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d0a34906ae9853…

MALICIOUS

PDF

39.9 KB Created: 2020-04-08 05:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3415c25a7f431b6b016c7316854e4831 SHA-1: 51eac44fdcc9c848953adc48e5be10fb325d1855 SHA-256: d3d0a34906ae985360625a530cc9a89b177f028652aba0d9f00b8f91830087c2
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, pointing to various PDF documents hosted on different domains. The ML classifier also strongly indicated maliciousness. This pattern suggests the document is designed to act as a link farm, potentially for SEO spam or to direct users to malicious content. No scripts were extracted, and the document body is largely unreadable, but the extensive link farm is the primary indicator 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://insurewithhoward.com/uploads/1/3/0/7/130775393/130775393.html#hipoglucemiantes+orales+nombres+genericos
    • http://hannahwilliamssportstherapy.com/uploads/1/3/0/8/130813796/8454262.pdf
    • http://pawsitiveffect.com/uploads/1/3/0/9/130969438/gobopedu_lujitixat_sovupe_jaxepidubaj.pdf
    • http://sweetpeaflorist.net/uploads/1/3/0/6/130605015/4555416.pdf
    • http://hybrid-cl.com/uploads/1/3/0/8/130814297/6455584.pdf
    • http://statecollegefamilyreunion.com/uploads/1/3/1/4/131406181/fuxizeripu.pdf
    • http://cambridge-wellbeing.com/uploads/1/3/0/2/130289246/f0120.pdf
    • http://anniestpierrephotographe.com/uploads/1/3/0/8/130814761/4087747.pdf
    • http://thenakedi.org/uploads/1/3/0/5/130543945/valedewoleboko-bovajafuj-limad-muparux.pdf
    • http://salvis-pupusas.com/uploads/1/3/0/5/130589094/355ca075.pdf
    • http://girlsgirlsgirlsmagazine.com/uploads/1/3/0/7/130739726/baliwave.pdf
    • http://culturephysics.consulting/uploads/1/3/0/7/130739618/baxifusapijo.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_off00006ff9.bin
11068d45b65323a29bff299db9ab00d7a241d016097bdc0df3e3f8c52abef1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 9104 bytes

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