Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfd8553da5254c8…

MALICIOUS

PDF

33.4 KB Created: 2020-05-13 05:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35cd6534a5f10713dbef01cabc8d33b6 SHA-1: de6e5541cde78814068346bcb14cdb4f2505220f SHA-256: bcfd8553da5254c8d49a1168568de34c1d003e49a0c969197ed685cb08e77e81
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, many of which point to other PDF files on different 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 numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://lukescholtes.com/uploads/1/3/0/7/130776085/130776085.html#chapter+3+ecosystem+ecology+multiple+choice+answers
    • http://market-blueprint.com/uploads/1/3/1/1/131163635/gozewidu.pdf
    • http://signedbygrace.com/uploads/1/3/1/3/131398138/tulutesudatadavetute.pdf
    • http://kpoprater.com/uploads/1/3/0/4/130476669/ec96501de8785.pdf
    • http://spotswoodland.com/uploads/1/3/0/4/130435787/moxavuposokivowosew.pdf
    • http://cleanpro888.com/uploads/1/3/0/8/130814014/donawup.pdf
    • http://sugarlandtxpersonalinjurylawyers.com/uploads/1/3/1/4/131483155/5303917.pdf
    • http://watchill.net/uploads/1/3/0/6/130603978/dagogewapukedumuzun.pdf
    • http://morph-bcs.com/uploads/1/3/0/7/130774999/mafuriwotonifanenef.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_off0000575f.bin
0f3b05fb014d48ef6f2b845bac2f5af2a9ca20c7777328acd33dabacac27a4d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x575F 10248 bytes

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