Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc65fd1a2bfd9787…

MALICIOUS

PDF

70.1 KB Created: 2020-04-10 10:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: aa22bb133ba00d698184ad59f5d5b9d0 SHA-1: 3cc2af9639d49f4e2d315e409d8372d3c70740d5 SHA-256: bc65fd1a2bfd9787624c76c969f1dfc764425caee657c540b4cb7526e41f27f5
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named PDFs hosted on various domains. This pattern is indicative of a link farm or SEO scam designed to drive traffic to potentially malicious websites. The document body, though heavily obfuscated, contains a reference to 'Parametric equations to rectangular equation', which appears to be a lure to attract clicks to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://arsengineeringservices.com/uploads/1/3/0/5/130590677/130590677.html#parametric+equations+to+rectangular+equation
    • http://toouniquedesigns.com/uploads/1/3/0/2/130272352/f62a6c.pdf
    • http://ultimateattainment.com/uploads/1/3/0/7/130775516/tirolove-sijine-xoturawuzarob.pdf
    • http://usucbs.com/uploads/1/3/0/6/130605312/d283b0e34.pdf
    • http://redomillenialspecialist.com/uploads/1/3/0/6/130604283/puvexanu.pdf
    • http://helpinghanddoc.com/uploads/1/3/0/8/130873872/wuzilaz.pdf
    • http://thepiqued.com/uploads/1/3/0/5/130550970/nepeboliranoket.pdf
    • http://periodic.digital/uploads/1/3/1/4/131452823/jigulam_kofadab.pdf
    • http://nashvillerollingpincompany.com/uploads/1/3/0/9/130969735/aa52d6034.pdf
    • http://ardyslexiasupportgroup.org/uploads/1/3/1/3/131398243/webagivon.pdf
    • http://gardenhui.com/uploads/1/3/0/2/130289696/2728829.pdf
    • http://mid-atlanticofficeportfolio.com/uploads/1/3/1/4/131437657/semoladanigenuf-gavelek-nesujipizuri.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf2.bin
53bc5c5cc7c2f331649cfee6672213d02187e9b462d8e0af2e160edbb3790f57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 9144 bytes
font_01_sfnt_off0000fecb.bin
985cbd9ba5b629f1b749d04d852c0eecb5d8ad374186a1044a60da9476420dc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 2788 bytes

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