Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a93ec112371820e…

MALICIOUS

PDF

40.8 KB Created: 2020-04-10 16:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0e231fdce79e30b09f04d87994912df SHA-1: e469fa86614b04b409b52a3cb6eb282aaa883fbf SHA-256: 6a93ec112371820e88cb63682d01cc5f26243dcb85204557c5a56acbf7e760c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. While no scripts were directly extracted, the embedded links are the primary indicators of malicious intent, likely serving as a lure to a phishing or malware distribution site.

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://lillyhouseofbeauty.com/uploads/1/3/0/4/130477176/130477176.html#symetrix+jupiter+8+power+supply
    • http://b2bmaintenance.com/uploads/1/3/1/4/131482995/paweva.pdf
    • http://wallaceprep.com/uploads/1/3/1/3/131379402/pojekevigej.pdf
    • http://blackbaycomics.com/uploads/1/3/0/6/130639329/9342321.pdf
    • http://eleanorfraser.com/uploads/1/3/0/8/130874285/d5ff4ebbd9e681c.pdf
    • http://pooldoctorlouisville.com/uploads/1/3/1/3/131384400/6681297.pdf
    • http://ioniealeisaartistry.com/uploads/1/3/0/6/130621244/wisig_zixosutedidox.pdf
    • http://mtnmaps.com/uploads/1/3/0/6/130605182/zorepasuxi-wetubowujil-suvur-pejepotugavev.pdf
    • http://waitingatastoplight.com/uploads/1/3/1/4/131437850/7124640.pdf
    • http://thekaizenexports.com/uploads/1/3/0/3/130323180/78d45c45469162.pdf
    • http://renanco.com/uploads/1/3/1/4/131453301/jofid.pdf
    • http://panelinha.net/uploads/1/3/1/4/131410479/fotavosivono.pdf
    • http://hooleyfish.com/uploads/1/3/1/1/131164246/sopawufinedo.pdf
    • http://realtidylawns.com/uploads/1/3/1/4/131414240/6550402.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aeb.bin
90a47c58f865d709725b549824e8f835ef4ec3537f19aca0b4f82cb3536fffd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEB 8580 bytes
font_01_sfnt_off00008bca.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCA 2828 bytes

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