Malicious PDF — malware analysis report

Static analysis result for SHA-256 75522d83b00270bb…

MALICIOUS

PDF

40.2 KB Created: 2020-04-08 07:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25b6d8437e6d4cef5b1999916e19622f SHA-1: dc3b13002907d5b55ecf1fdce4e72968f23d033b SHA-256: 75522d83b00270bbfc6bb4d836f6ff8a95a84a768841664938840b2b6d3150b5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded links.

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://wagenselleryoga.com/uploads/1/3/1/0/131070535/131070535.html#cuales+son+los+tejidos+vegetales+pdf
    • http://lifesliaison.com/uploads/1/3/1/4/131453990/5007937.pdf
    • http://transformationcoaches.net/uploads/1/3/0/3/130313027/gemuborujapa.pdf
    • http://rbrealty.ca/uploads/1/3/0/5/130547689/a33bcc19abe4a7.pdf
    • http://stpaulschurchfulda.org/uploads/1/3/1/4/131482812/miximimipira.pdf
    • http://sambafunkarts.com/uploads/1/3/0/6/130639662/zosetobasofa_fosera_sukajulupipuwiw_lemirutalatanak.pdf
    • http://portalindustries.org/uploads/1/3/0/7/130775370/wubuvuwuxot.pdf
    • http://takeaseatpittsburgh.com/uploads/1/3/0/6/130605167/a2169a6e1e708.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_off0000722c.bin
cebe04ac616eb47c4e23f23fe9bf6f4aa6c1dfc112ac7891f61719cde8f63704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722C 9208 bytes

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