Malicious PDF — malware analysis report

Static analysis result for SHA-256 79eca24b368b4ec8…

MALICIOUS

PDF

78.9 KB Created: 2020-04-27 19:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 102dbe557bdd2a2708ea002f8123dc92 SHA-1: 5938309be81a4e9796cf49dfe9bc83324fde0242 SHA-256: 79eca24b368b4ec87d640e31abf21b17e3d238fb92eb5167e9d967990e3eb7cf
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicating a link farm or SEO spamming technique. The ML classifier also flagged this PDF as malicious. The presence of these links suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9891

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://ramesart.com/uploads/1/3/0/7/130739201/130739201.html#mystic+messenger+another+story+guide
    • http://theabrock.net/uploads/1/3/0/4/130436058/jadujanuvedukaw-zivovebadu-narapuwuzur-woliwomivox.pdf
    • http://tracygurdwara.org/uploads/1/3/1/1/131164048/mabig_julakidumu_tawimunubur.pdf
    • http://cordialkitchenandbath.com/uploads/1/3/0/2/130287506/lenowu.pdf
    • http://uskcastlechase.com/uploads/1/3/0/7/130775825/6876904.pdf
    • http://rotinofeet.com/uploads/1/3/1/4/131438260/7469764.pdf
    • http://impairmenttestingaustralia.org/uploads/1/3/0/7/130776266/6544432.pdf
    • http://wristart48.com/uploads/1/3/0/6/130620887/vivegenu-fobitafaloxilaz-regorekilepuk-pidoxumori.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_off00010bc8.bin
bdf4e3f5fa1caf5f895f8306ae1a9bdb01a7634a3c84ba1834d378f3c19a9858		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 8916 bytes

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