Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d12ca6349075dcf…

MALICIOUS

PDF

39.0 KB Created: 2020-03-11 14:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4d31490b6ea12d9961e1d98fd5bb0cf0 SHA-1: df80984291ed6ba58e207e93f875a4c20bdd5163 SHA-256: 6d12ca6349075dcff498c9db9b021d409cb321f51a1f870d97c2e71d9e4b1a65
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF documents. The primary heuristic indicates a mass external PDF link farm, suggesting an attempt to manipulate search engine rankings or distribute content from numerous domains. While no scripts were explicitly extracted, the embedded URLs themselves are the main indicators of malicious intent, likely serving as a distribution or redirection mechanism.

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://www.throughalexaslens.com/uploads/1/3/0/7/130776356/130776356.html#papillary+thyroid+cancer+tnm+staging
    • http://fconferences.cirm-math.fr/uploads/1/3/0/4/130488574/7999542.pdf
    • http://rainchiangfoto.com/uploads/1/3/0/7/130775432/dafekodadadoj.pdf
    • http://www.2016toyotalandcruiserawd.com/uploads/1/3/0/7/130775730/9a72ec0a364.pdf
    • http://russianboutique.co.uk/uploads/1/3/0/5/130551087/5844309.pdf
    • http://www.zarasmusic.com/uploads/1/3/0/9/130969972/2221667.pdf
    • http://www.habeshashops.com/uploads/1/3/0/3/130313140/5644872.pdf
    • http://lanordichouse.com/uploads/1/3/0/5/130539697/2986359.pdf
    • http://northeastmarineelectric.com/uploads/1/3/0/5/130550743/7011ffff192963.pdf
    • http://chrisbrooksarchitecture.com/uploads/1/3/0/7/130739404/sepofin.pdf
    • http://phosgroupinc.net/uploads/1/3/0/7/130776003/bfc9adb952e.pdf
    • http://www.preciousdropyounglivingsabah.com/uploads/1/3/0/8/130813369/jibovajalo_nirodumer_lifaxedal_titex.pdf
    • http://dreamdamselart.com/uploads/1/3/0/4/130435938/4c8b48a.pdf
    • http://intimaterevolution.com/uploads/1/3/0/7/130776828/109583.pdf
    • http://www.chefnathanbates.com/uploads/1/3/0/2/130289554/6390287.pdf
    • http://crookedcrabbrewery.com/uploads/1/3/0/5/130551143/e18886.pdf
    • http://tubtechllc.com/uploads/1/3/0/8/130814731/xepipoli_zatavel.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_off00007285.bin
538d78a021855600c23838f1e95b10282599a40e11da0eac792da985a76e94a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 7128 bytes

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