Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5953a23ae9f9c9…

MALICIOUS

PDF

29.6 KB Created: 2020-03-30 08:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 743efef4d4838f14acc7b9639e9be9fd SHA-1: feb7cc8518f81073e95902a82cb501a65616d001 SHA-256: 6b5953a23ae9f9c93c09d7a3f2b898f66c292be7143575368959b98f1dd76e16
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files on unrelated domains. This behavior is indicative of a link farm or a distribution mechanism for malicious content. The ML classifier strongly supports the malicious verdict, and the embedded URLs suggest an attempt to redirect the user to potentially harmful content.

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://us.momotombochocolatefactory.com/uploads/1/3/1/4/131406541/131406541.html#gymnopedie+erik+satie+guitar
    • http://teacherplc.com/uploads/1/3/0/2/130271201/71111.pdf
    • http://nyayouth.com/uploads/1/3/0/2/130271165/03a001a0c.pdf
    • http://34lakest.com/uploads/1/3/1/4/131406239/tukovoviruriw.pdf
    • http://passdop.com/uploads/1/3/0/4/130476650/72afc93c5ca11c.pdf
    • http://besthawaiilandscaping.com/uploads/1/3/0/5/130550657/sowudawuvojom-soteza.pdf
    • http://mjpalazzo.com/uploads/1/3/0/6/130620847/befadutamavaxebo.pdf
    • http://cprspot.net/uploads/1/3/0/6/130621114/2909202.pdf
    • http://mpoweringpotential.com/uploads/1/3/0/7/130739535/6028323.pdf
    • http://geringvision.com/uploads/1/3/0/3/130313632/pilavikogukiropisul.pdf
    • http://webdisk.ev-resource.com/uploads/1/3/0/9/130969448/pepisobuvedusatufogi.pdf
    • http://applesandgears.org/uploads/1/3/0/6/130620366/2741303.pdf
    • http://goddessmedianyc.com/uploads/1/3/0/2/130288559/124576.pdf
    • http://geminidreams.net/uploads/1/3/0/7/130775215/5ed22fbf.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_off00004f7a.bin
1ca3c9461583e1686e59cae86a5ef3d10d52e63036087ae7180e4f9681913790		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F7A 6524 bytes

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