Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1ea414e332fae8…

MALICIOUS

PDF

41.2 KB Created: 2020-04-11 09:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 43e91438c567afde28132ba1871a2fbd SHA-1: 3d8001787f420808599509c89492eaf8f4063a5f SHA-256: 5f1ea414e332fae88ea9fedbaa73facc9981fbd9718928e99568e3b64f64d8a6
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various websites. The embedded URL `http://colddiamnd.com/uploads/1/3/1/3/131381680/131381680.html#rf4+gift+guide` is presented as a gift guide, a common lure for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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://colddiamnd.com/uploads/1/3/1/3/131381680/131381680.html#rf4+gift+guide
    • http://thevaughnrealestategroup.net/uploads/1/3/0/8/130873942/tivepupunur-newanoxizuv-viloririfuwolop.pdf
    • http://sgcparish.net/uploads/1/3/0/2/130273944/8661937.pdf
    • http://goncompany.com/uploads/1/3/0/6/130604446/xajutigedaled.pdf
    • http://atherapeuticqueen.com/uploads/1/3/0/7/130775756/02341.pdf
    • http://cherrycreekanglers.org/uploads/1/3/1/4/131437335/8454557.pdf
    • http://terrasuaka.com/uploads/1/3/0/4/130477864/7869128.pdf
    • http://rhcopywriting.com/uploads/1/3/0/6/130621031/419fdda87bde6b.pdf
    • http://miles-of-trees.org/uploads/1/3/0/7/130739776/pagezebezoj.pdf
    • http://tinaphillipsfreelancecopywriter.com/uploads/1/3/1/4/131408567/6398071.pdf
    • http://frontiercosmetics.com/uploads/1/3/1/4/131406527/wudidezulire-gipeguruginuriv.pdf
    • http://beautifulinhisname.com/uploads/1/3/0/8/130874352/sukixopaw.pdf
    • http://ip115-colo.mnemonix.com/uploads/1/3/0/6/130620172/rozugipozakarig.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_off000079db.bin
a1c7cea918ecd01cd7686067fd3a32c0442327b0bfe3790329cae0d0e05f52a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DB 8124 bytes

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