Malicious PDF — malware analysis report

Static analysis result for SHA-256 6972193d6f214467…

MALICIOUS

PDF

29.7 KB Created: 2020-06-12 07:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3f6f6520db7e7adf89f87dd6dd491f1 SHA-1: 74366634a99dea2025a67ce913d5774bd251cf17 SHA-256: 6972193d6f21446760d0f20476ca07ffbcc85bca1a57e94a009e9e856b22fdf5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The embedded document body text, while appearing garbled, contains URLs that are also listed in the extracted URLs, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mail.wasmex.org/uploads/1/3/0/7/130738882/130738882.html#you+shook+me+all+night+long+drum+lesson
    • http://413115825.rkfischer.com/uploads/1/3/0/3/130323930/xatexulol.pdf
    • http://kaywoo.com/uploads/1/3/0/7/130740297/3671956.pdf
    • http://shadowriderwoodcraft.com/uploads/1/3/2/3/132303242/ff5d5bdd35.pdf
    • http://outofmywritemind.net/uploads/1/3/0/6/130604090/d7c1bff.pdf
    • http://sendmail.emeraldmanagers.com/uploads/1/3/0/8/130873937/zumasasenatoju-binesalagururir-fibivani-pilogazekig.pdf
    • http://njknights.com/uploads/1/3/0/8/130814284/rexonunezoredubewe.pdf
    • http://eastbaycarpetcleaning.net/uploads/1/3/0/9/130969703/wijilewuxa-lonom.pdf
    • http://mail.speluqueros.com/uploads/1/3/0/5/130550910/87509f0f841.pdf
    • http://mta-sts.mail.ilovebuttercups.com/uploads/1/3/1/3/131382486/birogumepeworitov.pdf
    • http://5r65d7.bdgct.com/uploads/1/3/0/6/130621376/dupazorigam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wawotofureje.files.wordpress.com/2020/06/6374409696.pdf
    • https://zotaxaf.files.wordpress.com/2020/06/40794836748.pdf
    • https://laxerinu.files.wordpress.com/2020/06/21424855233.pdf
    • https://riburawonak.files.wordpress.com/2020/06/rakaz.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a91.bin
0767b7a4c6b698124db2d8bfea6413b6ba8fecb16cf499ec36c54b035a521ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A91 9532 bytes

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