Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa83ccb67f05274e…

MALICIOUS

PDF

39.3 KB Created: 2020-04-07 22:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: c1b7b1acda99c156edadbb7a229cfeab SHA-1: 017a9455fae85455001d0c539ac8c72ab6d9f0e3 SHA-256: aa83ccb67f05274ef97e5f2d12efea7b716b960a6ad1e02bf5578364ccd1b304
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO poisoning or to distribute malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs are the primary IOCs, suggesting a link farm or redirection scheme. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kimresine.ca/uploads/1/3/0/8/130814208/130814208.html#denon+dl110+moving+coil+cartridge PDF link annotation
    • http://hapihawaii.net/uploads/1/3/0/5/130550970/jugoximezipo.pdfIn PDF document text
    • http://www.bergcopy.com/uploads/1/3/0/5/130550782/ecdbd7f9ea3dd4.pdfIn PDF document text
    • http://targettradingsystem.com/uploads/1/3/0/2/130270904/somutipajo.pdfIn PDF document text
    • http://hassetthomeimprovement.com/uploads/1/3/1/1/131164095/xabutezepume-vilanu.pdfIn PDF document text
    • http://lacharite.net/uploads/1/3/0/3/130313686/vemafenotegaga-wujabirasi-kemudaropim.pdfIn PDF document text
    • http://alltheweirdabundance.com/uploads/1/3/0/6/130639488/xisovuzijimujaje.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A5F 8660 bytes
SHA-256: 7bd18fdadcd4413e9a125c871fb3dab9672ca71f89af5d9899647c1deabd7879
font_01_sfnt_off00007bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC0 16036 bytes
SHA-256: ddc6c38a5929b263b215a5b0c7aa8b1a409f146866f06980111f9f21a6232bf4

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