Malicious PDF — malware analysis report

Static analysis result for SHA-256 601dc8c60bb0b0de…

MALICIOUS

PDF

48.6 KB Created: 2020-04-12 20:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b9a6cbdeafea6eef949c54d2b10c14a1 SHA-1: c3804b0475852b727b125eaed90bd070990a13b3 SHA-256: 601dc8c60bb0b0deaa1d046f64621269c32cbfaff73da874c7d67aa8179dfee5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://teddybaby.org/uploads/1/3/0/5/130589158/130589158.html#temas+y+generos+del+boom+latinoamericano
    • http://kristintrible.com/uploads/1/3/0/5/130588281/3472551.pdf
    • http://alexantic.com/uploads/1/3/0/6/130621096/999383.pdf
    • http://playingsuperhereos.com/uploads/1/3/0/5/130550817/1d14e873ed.pdf
    • http://petportraitsbyjanedolan.com/uploads/1/3/0/4/130491001/2045225.pdf
    • http://premiergencontracting.com/uploads/1/3/0/2/130273584/3a7701.pdf
    • http://gbwtrading.com/uploads/1/3/0/2/130273748/gazuxis_zajadum_majujunir.pdf
    • http://equisociety.net/uploads/1/3/0/8/130874469/jafitate-pepumofogetiwa-pusolawisa.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_off0000939d.bin
767d5c67316a99510f99b827fd01ee07226f925437b2312050e182ea0fe9616a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x939D 9184 bytes

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