Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bb8589fb03ed0f…

MALICIOUS

PDF

35.5 KB Created: 2020-04-11 03:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2f5ee49895fe1b59dfd4c13d63bf80c0 SHA-1: 6128ec78bf59ed23ffd1f20ad17e8bebac16852e SHA-256: 78bb8589fb03ed0fc0dbfaeeba3393fcd6a181c5a5541f016bad5c7f0d8dbda1
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO spam campaign, designed to drive traffic to various sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links suggests a malicious intent to redirect users.

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://qualitycareafh.com/uploads/1/3/0/6/130620902/130620902.html#esl+worksheets+for+beginners+vocabulary+pdf
    • http://swansong.me/uploads/1/3/0/2/130291822/391708.pdf
    • http://laurenkatestewart.com/uploads/1/3/0/7/130739268/magomexaturepa-watakonuxo-pevozitibuxole-kirovi.pdf
    • http://christcenteredcourting.com/uploads/1/3/1/1/131163563/6170984.pdf
    • http://roybivpotatochips.com/uploads/1/3/0/5/130539837/7525237.pdf
    • http://electromecaniqueinternational.com/uploads/1/3/0/6/130621521/6757797.pdf
    • http://carsonsphotos.com/uploads/1/3/1/4/131452818/zopuxesimijo.pdf
    • http://ballerweekly.com/uploads/1/3/0/7/130776174/rugexafupali.pdf
    • http://hqarchives.space/uploads/1/3/0/6/130604533/2e3d4.pdf
    • http://dreamgirlskloset.net/uploads/1/3/1/4/131437546/8caded131c91fca.pdf
    • http://imperial-finances.com/uploads/1/3/0/9/130969563/46e04490a7.pdf
    • http://aboutrussandvanessakyff.com/uploads/1/3/0/6/130621330/12e90.pdf
    • http://lastworkout.com/uploads/1/3/0/4/130483799/xezogurozi.pdf
    • http://dreamgirlskloset
    • 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_off000061ce.bin
4ce580243a4e3f4aa22fdf38eab12796ea24ac503801f290e8b5353433bda213		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CE 7824 bytes

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