Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f3e6d0c3f2d390…

MALICIOUS

PDF

43.8 KB Created: 2020-06-07 05:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f12aa049e721dff2090c5a1a231f915e SHA-1: 785ecb7df81484e88898e9319ede316f8e68039f SHA-256: a7f3e6d0c3f2d390b503b90dda3353871339776981ce06fe2e567908e49d037e
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, many of which point to other PDFs hosted on similar domains. This pattern is indicative of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is largely unreadable, but the presence of numerous SEO-optimized PDF links suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://myuniquekreations.org/uploads/1/3/1/4/131483112/131483112.html#estado+de+resultados+de+un+restaurante+peque%25C3%25B1o
    • http://truefertilitysc.com/uploads/1/3/0/9/130969445/gologusefirewil.pdf
    • http://memoriasdejulietafotografia.com/uploads/1/3/0/2/130289649/wajojamurolulavu.pdf
    • http://villagenutritionri.com/uploads/1/3/1/3/131381428/nonemidugoj.pdf
    • http://chadnewbry.com/uploads/1/3/1/6/131637046/1042701.pdf
    • http://dcciinspections.com/uploads/1/3/0/6/130622092/gejokafafer.pdf
    • http://alternativehmg.com/uploads/1/3/0/7/130739764/a93aaa81970e7dc.pdf
    • http://149.undesirable.us/uploads/1/3/0/7/130740324/piveje_nilalexelubule_xunesesaposuf_nekorobobi.pdf
    • http://mcdannaldconstruction.com/uploads/1/3/0/6/130639273/boteditage-tebamibojila-sukagajibor-lusamuv.pdf
    • https://lulerodibo.files.wordpress.com/2020/06/81841003927.pdf
    • https://zemajuku.files.wordpress.com/2020/06/42576767900.pdf
    • https://dosorefoz.files.wordpress.com/2020/06/feseborasekuju.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_off00007ab1.bin
e04f4fc74bc4b2a6ab1e580f471924c5c9240cff1b976a13b2017775cbbeac33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 11904 bytes

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