Malicious PDF — malware analysis report

Static analysis result for SHA-256 251b966f17b1d505…

MALICIOUS

PDF

35.6 KB Created: 2020-04-09 09:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25efecc5d87585deb39edbc729ebb67b SHA-1: c2cffaecb8a3ae42595b5693bbb17ad441113fcb SHA-256: 251b966f17b1d5055779febf09be5dfda1572e3fb20bc1107a3510ff440b372a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting this assessment. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://kaztruckingllc.com/uploads/1/3/0/8/130814596/130814596.html#new+mexico+historical+review+index
    • http://a-aon.com/uploads/1/3/1/3/131381420/166069.pdf
    • http://votened.net/uploads/1/3/0/7/130775725/semotume-dedinu-wufepinu.pdf
    • http://topdollar4junk.com/uploads/1/3/0/5/130545278/zipofuvokonu.pdf
    • http://commercialresources.info/uploads/1/3/0/7/130739336/9672512.pdf
    • http://oromyojennygigharbor.com/uploads/1/3/0/6/130603904/a7f428701.pdf
    • http://neugebauerforgreen.com/uploads/1/3/0/5/130552106/jofigixaxapilo-kisogujami.pdf
    • http://blackseedorganicoil.com/uploads/1/3/0/3/130379411/nazusolire-kunenu-zemoziwogozuzi.pdf
    • http://juniorvolunteerleague.org/uploads/1/3/0/6/130604973/gobejesabeleb.pdf
    • http://takingcareyoga.com/uploads/1/3/1/4/131406604/mozonitisuweb_patufasewawu_xopujoned.pdf
    • http://andres-historical.com/uploads/1/3/0/6/130639710/8916343.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_off000064f4.bin
8fed0feb07b928e1ca64a86936fd94da96e624fce51124f597418cd9841b408f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 7412 bytes

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