Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27414df3d444e1b…

MALICIOUS

PDF

36.0 KB Created: 2020-05-28 23:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8d86c8f26391f26c26dc435a0a6cab0 SHA-1: 18e5a6a9e13504709f78446029c346e640414382 SHA-256: f27414df3d444e1b6c948c1a62737ccf5154721449f790ce0c6905f403c0177d
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded document body text, while partially corrupted, contains some of these URLs, suggesting the document's primary purpose is to redirect users to these external resources. The specific intent of these external links is unclear without further analysis, but the sheer volume and the nature of the domains suggest a link farm or distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pinchapennytravel.voyagerwebsites.com/uploads/1/3/0/7/130776808/130776808.html#music+theory+for+computer+musicians
    • http://emerycontracting.trustabiz.com/uploads/1/3/0/6/130603748/reranavoj.pdf
    • http://alchemysticvibes.shop/uploads/1/3/1/0/131071095/db02a.pdf
    • http://jeremiahcoyle.com/uploads/1/3/0/5/130542736/zajesitoladefiv.pdf
    • http://leahmarshall.com.au/uploads/1/3/0/7/130738854/manetawed_gikosim_lipexas.pdf
    • http://agendarestoid.com/uploads/1/3/1/4/131454065/e8b8287.pdf
    • http://mail.jeanmancinigough.com/uploads/1/3/0/7/130775229/2422787.pdf
    • http://inccorectacctns-valdapplls.info/uploads/1/3/0/3/130313113/wuwovovarero.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_off00006112.bin
dcddd6e9948a19dfc42f873cc7c9b80744213f0e63682801c73e8108495d5eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 10480 bytes

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