Malicious PDF — malware analysis report

Static analysis result for SHA-256 5126be127bfa7e8e…

MALICIOUS

PDF

54.4 KB Created: 2020-04-07 05:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8c1f2db6cf22e3f304d382b5380fd6a SHA-1: f0f8cad6fce47186cb0bff08211321ea58e47e37 SHA-256: 5126be127bfa7e8e2fe8828d6b8205d3869eb05f49dc6164098db4997c6ab6f5
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to numerous external domains, likely for SEO spam or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pranzotruck.com/uploads/1/3/1/4/131406611/131406611.html#genero+literario+dramatico+autores
    • http://fernandoconstruction.net/uploads/1/3/1/3/131379320/9c05930e123b1.pdf
    • http://tuffnlitehockey.com/uploads/1/3/0/7/130775537/171b15cd47.pdf
    • http://greentreelandscapinglc.com/uploads/1/3/0/2/130289772/lidujolilesu.pdf
    • http://philipmertens.com/uploads/1/3/0/5/130542977/6865388.pdf
    • http://fknhigh.com/uploads/1/3/0/6/130639966/zezez_dogamijabes_bamusiwozo.pdf
    • http://massagetherapysc.com/uploads/1/3/0/6/130604081/9209098.pdf
    • http://mrscottcaudill.com/uploads/1/3/0/7/130738755/gogobegateja.pdf
    • http://designwithnatives.us/uploads/1/3/0/7/130740340/31053.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000873d.bin
845aef17a073b0880f8e6bda1f5d712b0729dbd385fa22abf2b2cff806d7df20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x873D 9252 bytes
font_01_sfnt_off0000a7ec.bin
e09399dfb4fbf221a1929ae49229b4db3410d2965296cb2d226bee1e40f3f335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EC 3964 bytes
font_02_sfnt_off0000b4b9.bin
c708b76750ca75940e32cfd02316d769db85f68aac90898ce95ad0984283925c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 16280 bytes

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