Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2e32829ec2c530…

MALICIOUS

PDF

41.1 KB Created: 2020-04-02 05:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6949b7f3e8ae1b512b2ad254ad387b4 SHA-1: c61d32120e3885d65716e82a3b983e60cd881ac3 SHA-256: 7a2e32829ec2c530a1a73192111a8a64d9c7850683d088000ed6f132b6f35bbc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this assessment. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful external sites.

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://michaelwelsh.org/uploads/1/3/0/6/130605168/130605168.html#ejercicios+sobre+los+husos+horarios
    • http://erosconference.com/uploads/1/3/0/4/130489771/bomedugapupe.pdf
    • http://businessarenainc.com/uploads/1/3/0/6/130620818/8387651.pdf
    • http://tinaphillipsfreelancecopywriter.com/uploads/1/3/0/7/130775276/wifajesubilemip_tuvidotem.pdf
    • http://marieskubon.com/uploads/1/3/0/5/130539130/perutenibedikavim.pdf
    • http://ernestoecheverriaaispuro.com/uploads/1/3/0/5/130539654/3c6c72.pdf
    • http://sunshinevacay.net/uploads/1/3/1/3/131380205/c101bcdde.pdf
    • http://cirm-math.net/uploads/1/3/1/3/131379706/vibenakub_nafijikib_jufonid.pdf
    • http://kinoseriya.club/uploads/1/3/0/3/130324170/2590753.pdf
    • http://mrsjanebrooks.com/uploads/1/3/0/6/130639611/1a1ff6.pdf
    • http://neoliva.org/uploads/1/3/0/2/130272241/pajipubuda.pdf
    • http://reachnearbycells.com/uploads/1/3/0/5/130588380/3164612.pdf
    • http://mcneileconomics.com/uploads/1/3/0/4/130488251/jetula.pdf
    • http://girishmithran.com/uploads/1/3/0/6/130604269/5016597.pdf
    • http://lcofitness.com/uploads/1/3/0/9/130969082/4659752.pdf
    • http://djumilux.com/uploads/1/3/0/3/130323630/mutijoresuzoro_zejifusopuvozi.pdf
    • http://kisaemigrantmuseum.se/uploads/1/3/0/4/130483499/gurimumomisepojakig.pdf
    • http://themcjams.com/uploads/1/3/0/9/130969179/witoradajumuzi.pdf
    • http://www.prayinguponastar.com/uploads/1/3/0/5/130540897/e11de67d96d15.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_off000072da.bin
0fe6a9e49fc8b5962c1390a267ba1cbe6d450477e4d0b5f7f998422bd754a244		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 9660 bytes

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