Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65cb3a17e683298…

MALICIOUS

PDF

57.6 KB Created: 2020-05-31 12:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cba7af745acd38bb56e1ca81fc8e15c6 SHA-1: c27a68c9627cd4e6328ecc78c9298d1a047679d5 SHA-256: f65cb3a17e6832983d2692b50417aeca59fa9b592abd887f4a44394f495d63da
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, as detected by the PDF_SEO_LINK_FARM heuristic. The document body also contains a prominent URL, suggesting a lure to external content. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the extensive link farm points to a likely SEO-based distribution or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lovelightshop.com/uploads/1/3/0/6/130639646/130639646.html#getting+started+with+spring+framework+covers+spring+5+pdf
    • http://cpanel.ashleyrawlingsphotography.com/uploads/1/3/0/3/130313183/f98b1e56e08.pdf
    • http://stmaryofthepinesalumniassociation.org/uploads/1/3/0/7/130739517/kukeb_zesojunaroveto_pezefolebisoxo.pdf
    • http://ancientflyingmachine.com/uploads/1/3/0/4/130483542/b1f6bbf.pdf
    • http://sideexperience.com/uploads/1/3/0/5/130545241/maxawaj-vobaxog-neluxaz.pdf
    • http://aspenvalley.org/uploads/1/3/0/5/130539139/tipubaruwasi.pdf
    • http://balletplus.ca/uploads/1/3/0/7/130739269/83a5f10.pdf
    • http://mta-sts.mail.nessflett.com/uploads/1/3/0/9/130968988/lupatijaxesumi_gunuraposakip.pdf
    • http://blog.bonafidegreengoods.com/uploads/1/3/1/6/131637030/dofabevi-disuram.pdf
    • http://only1darko.com/uploads/1/3/1/6/131606858/tazejet.pdf
    • https://mozujunovuj.files.wordpress.com/2020/05/xidanazerelozen.pdf
    • https://mijawodemim.files.wordpress.com/2020/05/27974371365.pdf
    • https://robepeler.files.wordpress.com/2020/05/zavatabinin.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ba0.bin
f209a1942b0965439ceab9104f95966b54c724cddbedb29c639392d5ba72961b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA0 35848 bytes
font_01_sfnt_off0000b99f.bin
4a170d0309f807d85e95cf41c35f97bb8bee3a6106be838c9f76affd2eb65731		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99F 8884 bytes

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