Malicious PDF — malware analysis report

Static analysis result for SHA-256 7159cb0167868f89…

MALICIOUS

PDF

37.2 KB Created: 2020-06-12 04:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71c4686340584b4357a3dcb6f51475a7 SHA-1: d95e66af1766c2c0d230232fd9f2283d7e9ddb03 SHA-256: 7159cb0167868f894d998b59171d3c9958f4e2914319d6f37eee2671015b9db0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a malicious intent to redirect users to potentially harmful sites. The ML classifier strongly supports the malicious verdict.

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://taiyangchengyulewang888ya.br3h.com/uploads/1/3/1/8/131856890/131856890.html#django+widgets+tutorial
    • http://gu.undesirable.us/uploads/1/3/0/4/130478709/verutobepif.pdf
    • http://cusoeprofessionaleducation.org/uploads/1/3/1/1/131164538/zegimasa-lowegu-jejuboz-mekeselawola.pdf
    • http://2280batesave.com/uploads/1/3/0/8/130874434/8671f.pdf
    • http://paisleyjoe.com/uploads/1/3/0/5/130552073/4321001.pdf
    • http://browistryandglow.com/uploads/1/3/0/6/130621156/wubelogixoba_wukanoruxi_nuparezeseti_wewufotoroxuf.pdf
    • http://yourforte.info/uploads/1/3/0/5/130589420/4187253.pdf
    • http://it.masofrancesco.com/uploads/1/3/0/5/130589122/tifexibegasugul_mejoruwasum.pdf
    • http://jbsolutionslondon.co.uk/uploads/1/3/0/7/130775688/watujupe-dewitidakirabi-pukuf-jifularodidime.pdf
    • http://hostmaster.thuiskomeninjezelf.be/uploads/1/3/0/3/130313054/wovubadexiju-vulunov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://xazitowede.files.wordpress.com/2020/06/nofibepuwemarawetofuboxo.pdf
    • https://tazomaru.files.wordpress.com/2020/06/zetavi.pdf
    • https://sivedup.files.wordpress.com/2020/06/memosugedumibosevosov.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_off00006368.bin
f5f1fc78906156cb25a06b58fcf91868989398856d8c6cc0dd49f90280196d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6368 11048 bytes

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