Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0861fa384a7f2d7…

MALICIOUS

PDF

38.0 KB Created: 2020-03-24 08:30:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e125a965327d6e9ed208adec0b4908ce SHA-1: 0bdfd0f61184cad20f2d28d70753e18d3fc1c4bd SHA-256: a0861fa384a7f2d72f0a0144fd4e84aa6d796910895b897101f941bf527a8d38
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similarly structured domains. This pattern is indicative of a link farm or SEO poisoning technique, likely intended to redirect users to malicious content or to inflate search engine rankings for malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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://beingself-centered.com/uploads/1/3/0/9/130969331/130969331.html#canciones+para+misa+de+hoy
    • http://biohaircarethailand.com/uploads/1/3/0/3/130313368/sikopo_regagemetar.pdf
    • http://stanislaus-localroadsfirst.com/uploads/1/3/0/8/130873863/4725027.pdf
    • http://myfinancialarrowbusinesses.com/uploads/1/3/0/4/130489377/rowesawizi-sabafe-gigabonufur-kupopuzimela.pdf
    • http://pineiroslandscaping.com/uploads/1/3/0/7/130775292/de5784dbaa5b12c.pdf
    • http://goldenhawksband.com/uploads/1/3/0/5/130551775/sevezaveralebas.pdf
    • http://mta-sts.waynederman.com/uploads/1/3/0/3/130379132/vexagaputomi.pdf
    • http://bodybybuoy.com/uploads/1/3/0/5/130539114/muzekined-tajesasali.pdf
    • http://sim-analytics.com/uploads/1/3/0/4/130477293/ludegozotaxilag.pdf
    • http://quinne.net/uploads/1/3/0/5/130543552/1fd4441417d.pdf
    • http://xlrs.co.uk/uploads/1/3/0/8/130874488/gizukonuzinaxuwa.pdf
    • http://elitesip.com/uploads/1/3/0/2/130291724/7725106.pdf
    • http://espacodebelezapimentarosa.com/uploads/1/3/0/4/130483318/4608188.pdf
    • http://petersondentistry.net/uploads/1/3/0/5/130588928/wojeruseso.pdf
    • http://71delmar.com/uploads/1/3/0/4/130489168/derilupu.pdf
    • http://www.utilformas.com/uploads/1/3/0/5/130551342/leraviwob.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_off000069b9.bin
5312c86760c634f4d62f8133e9ea2c9fdfe90f0ece5b152bf0432565b55ebde1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69B9 8628 bytes

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