Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e460e9b0983b9e3…

MALICIOUS

PDF

41.7 KB Created: 2020-03-30 07:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 16789fc0ed983687f2bec44e90f573bb SHA-1: 0bc5f913bcf9ca9efdb2490e30898dd69b4711a7 SHA-256: 5e460e9b0983b9e31db2b98fed94b2342e146e6e64a52ba95b89f15db16af72a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content across many sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or purpose beyond link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://glendalepoolcleaners.com/uploads/1/3/0/3/130313140/130313140.html#5+ejemplos+de+reacciones+quimicas+con+ecuaciones
    • http://jordanjzadra.com/uploads/1/3/0/9/130969420/mudabara.pdf
    • http://rocheleautechnosoft.com/uploads/1/3/0/6/130605255/6709766.pdf
    • http://simplyspeak.net/uploads/1/3/0/7/130739287/rilev.pdf
    • http://luxeaam.com/uploads/1/3/0/7/130738705/1073056.pdf
    • http://chicagovcollective.com/uploads/1/3/0/9/130969853/4346453.pdf
    • http://nirvanatails.org/uploads/1/3/0/8/130874377/vosal_lasowowore.pdf
    • http://daveashman.com/uploads/1/3/0/7/130775176/piweve-vavukun-piniguxedizof-dapenizij.pdf
    • http://everywitchway.org/uploads/1/3/0/2/130288600/7393945.pdf
    • http://beckysdiner.net/uploads/1/3/0/5/130588984/e7b0a.pdf
    • http://evervinedesigns.com/uploads/1/3/0/8/130813967/9976103.pdf
    • http://vonhausbura.us/uploads/1/3/0/5/130539944/07a0040c6ced.pdf
    • http://nleautorepair.com/uploads/1/3/0/7/130739182/tikunasowofuzuto.pdf
    • http://mudwynpool.com/uploads/1/3/0/6/130605219/xalufav.pdf
    • http://comparejetcharters.com/uploads/1/3/0/5/130539034/jalitemedi.pdf
    • http://capecodgardener.com/uploads/1/3/0/6/130639747/9734923.pdf
    • http://conservationcontrols.net/uploads/1/3/0/3/130312971/wivupul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eaa.bin
2bdd60f22e8282ec10f2bad3a4b038349a7d363dc0c54ad287b01fe875f4bcb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 8460 bytes
font_01_sfnt_off00008da9.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA9 2652 bytes

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