Malicious PDF — malware analysis report

Static analysis result for SHA-256 897965bf78147e2a…

MALICIOUS

PDF

34.4 KB Created: 2020-06-02 20:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb7b242670ebd26f8a7ce0ad95d9f0ef SHA-1: 67fd5003b25386c552152a3d5549e3fb63a0f894 SHA-256: 897965bf78147e2a214db87f03014157ffcab78cc91b60d8c90db1af68b05247
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted IOCs. The primary purpose appears to be directing users to these external sites, likely for malicious purposes such as phishing or malware distribution.

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://teamabsolutesecurity.net/uploads/1/3/0/2/130270911/130270911.html#neewer+nw-+700+driver
    • http://kenilworthaquaticgardens.com/uploads/1/3/1/4/131406386/63e2dc14711d5.pdf
    • http://mx.theartnestgallery.com/uploads/1/3/0/5/130588395/56762e371.pdf
    • http://nhjpmaryseavey.org/uploads/1/3/0/4/130494289/e00965374a98477.pdf
    • http://mx0.milavanrosen.com/uploads/1/3/1/4/131438523/jimaxeb-migepu.pdf
    • http://teamabsolutesecurity.net/uploads/1/3/0/2/130270911/terms.html
    • http://teamabsolutesecurity.net/uploads/1/3/0/2/130270911/dmca.html
    • http://teamabsolutesecurity.net/uploads/1/3/0/2/130270911/policy.html
    • https://sulajuxije.files.wordpress.com/2020/05/lumibatodoxesepuzumolesaj.pdf
    • https://rususapeker.files.wordpress.com/2020/05/81842375311.pdf
    • https://potataz.files.wordpress.com/2020/05/garewejit.pdf
    • https://vewowudixune.files.wordpress.com/2020/05/fezivovekin.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_off00005930.bin
e2fcafb05baebd623e5b49ad9b1c9aa74f2f015570c30f91d0569a3abb6de4d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5930 10920 bytes

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