Malicious PDF — malware analysis report

Static analysis result for SHA-256 623c9234c937ce61…

MALICIOUS

PDF

28.9 KB Created: 2020-06-05 02:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebbdde49b9e5246276782edefe6052bb SHA-1: 064e3a49a91b407c969d6e49e1215bd417cacbba SHA-256: 623c9234c937ce611a76bc359c8e7f2c3139fa1d28b668b21546d33ecf141e57
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains references to these URLs. The primary function appears to be directing users to a vast collection of other PDF files hosted across numerous domains, potentially for SEO manipulation or to serve as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://veehiveproductions.trevelle.com/uploads/1/3/1/4/131437784/131437784.html#simbologia+hidraulica+festo+pdf
    • http://couplesws.com/uploads/1/3/0/7/130775704/f12ab57920571.pdf
    • http://noshcandyco.com/uploads/1/3/1/8/131872087/7ad995e16dde.pdf
    • http://ralismadeira.pt/uploads/1/3/0/7/130740151/124ce.pdf
    • http://mountsautorepair.com/uploads/1/3/1/4/131453558/fumisibul.pdf
    • http://montaquedevelopment.com/uploads/1/3/1/4/131454093/422c1b7afa33a09.pdf
    • http://olddominionsausage.gammaxiques.org/uploads/1/3/0/5/130589281/7520737.pdf
    • http://justballoonsandpartysupplies.com/uploads/1/3/1/4/131437089/8749b6ac.pdf
    • http://entre2pays.shop/uploads/1/3/1/4/131437709/01ddfd71af8e852.pdf
    • http://uea-club.com/uploads/1/3/1/1/131163725/pofivasibuxovanom.pdf
    • http://veehiveproductions.trevelle.com/uploads/1/3/1/4/131437784/terms.html
    • http://veehiveproductions.trevelle.com/uploads/1/3/1/4/131437784/dmca.html
    • http://veehiveproductions.trevelle.com/uploads/1/3/1/4/131437784/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tivexow.files.wordpress.com/2020/06/69028834992.pdf
    • https://fefuderenoro.files.wordpress.com/2020/06/89071209677.pdf
    • https://jobajurijemo.files.wordpress.com/2020/06/fezajujolewubajademuwodu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004908.bin
0ca6a60fce6e6cd5d9ddd41024349df0fb5cc6e952edf32718fa53f6eabe8c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4908 9420 bytes

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