Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3a2aa47094563b…

MALICIOUS

PDF

38.2 KB Created: 2020-04-07 11:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2510581a78d2d99e4d3298d27b3652fe SHA-1: ff324a7f26c2d186d9a26079ffa8155dd0ed6151 SHA-256: 3b3a2aa47094563baf70ada4c0e0f92adee7ad4ca0c7d32b92522360c599d95a
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts numerous external links to other PDFs. The document body also contains embedded URLs pointing to various domains, suggesting a lure to a collection of SEO-optimized content. No scripts were extracted from this sample, and the primary malicious activity appears to be directing users to a network of potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dynardy.com/uploads/1/3/1/4/131453096/131453096.html#left+palatine+tonsillar+abscess+icd+10
    • http://jamestownseries.net/uploads/1/3/0/7/130775498/216cce47.pdf
    • http://punjabtrips.com/uploads/1/3/0/5/130551002/mufajuwolapaxam-piveviwub-kejak-pigafagalutasow.pdf
    • http://innovateimpactengage.com/uploads/1/3/0/6/130603979/419a8760.pdf
    • http://wedding-violin.com/uploads/1/3/0/2/130289431/5889db6fc96.pdf
    • http://putzen-fuer-sie.ch/uploads/1/3/0/7/130775911/912e7276d.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_off00006e47.bin
0d5fac1d01467fce08ed1ab6c899c099fb1b9bb3471608ba7953bc6762492224		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E47 7804 bytes

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