Malicious PDF — malware analysis report

Static analysis result for SHA-256 868655264f0f1e39…

MALICIOUS

PDF

43.9 KB Created: 2020-04-10 04:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 295692f6dba9ec2f34d1b68d3dffc8c8 SHA-1: 7903d8e8fd0df27f3a458e92f5c3afd4b795b650 SHA-256: 868655264f0f1e39f366a89a181809720401216766e8852958b26e602ac7ae2e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO link farming or to redirect users to malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive link farm suggests a delivery mechanism for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://multifamilygroup.net/uploads/1/3/0/2/130289763/130289763.html#air+cap3502i+a+k9
    • http://hiddenhollowwellness.com/uploads/1/3/0/6/130604715/sexidabavoba.pdf
    • http://icomuniquese.net/uploads/1/3/0/6/130620929/c83bc20bb4403b.pdf
    • http://rezipper.com/uploads/1/3/0/9/130969371/1890996.pdf
    • http://mountedcharger.com/uploads/1/3/0/5/130589237/9326190.pdf
    • http://jazznbluesacademy.org/uploads/1/3/1/3/131380547/nebizovoxad.pdf
    • http://equippat.com/uploads/1/3/0/5/130590108/linoxikijode.pdf
    • http://dunkedanddrizzled.com/uploads/1/3/0/6/130604025/2fef71b1.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_off00008194.bin
2befaccdc6b39febe981197ed2e7d9f40362a315b89dc986edcca5ed1959fce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8194 8880 bytes

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