Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e9f65ada2918d3…

MALICIOUS

PDF

31.6 KB Created: 2020-04-02 16:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d81e55db5e51143186a2e5a3afb2600 SHA-1: f12a8449fd3c6feefcc5a790759ebb86b9602b21 SHA-256: 63e9f65ada2918d395595c3749a3c5d8aca5e72b9f8bbb782e6f53a241bb3561
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a PDF_SEO_LINK_FARM heuristic. The primary link points to a page that itself contains further links to PDF documents hosted on various domains. This suggests a campaign to manipulate search engine results or distribute content from a network of compromised sites. The ML classifier strongly supports the malicious nature of this PDF.

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://buyherepayherezerodown.com/uploads/1/3/0/5/130551991/130551991.html#cours+electrotechnique+bts+pdf
    • http://ang-web01.anglianetwork.eu/uploads/1/3/0/6/130639990/73332c9b2f083.pdf
    • http://wildmansoap.org/uploads/1/3/0/7/130739061/4110553d4.pdf
    • http://eqdesignllc.com/uploads/1/3/0/5/130543761/b6cc4d70ad1.pdf
    • http://petit-peche.de/uploads/1/3/1/4/131413766/sesediv-jumob-pawesevotul-jejenawut.pdf
    • http://centralkentuckybuilders.com/uploads/1/3/1/1/131163725/jedofidulafefuso.pdf
    • http://communitywealthmi.com/uploads/1/3/1/1/131164020/4ebd9efd63455cc.pdf
    • http://moonlightllamas.com/uploads/1/3/0/5/130551143/e5dfebd5.pdf
    • http://iamgabalicious.com/uploads/1/3/1/4/131409546/ziganeredulaka.pdf
    • http://streamkingztv.info/uploads/1/3/0/7/130738487/3412269fc402cbe.pdf
    • http://kidsenglishacademy.com/uploads/1/3/0/5/130589020/dexoludozexapitar.pdf
    • http://panelinha.net/uploads/1/3/1/4/131408086/xepafe.pdf
    • http://easyneo.com/uploads/1/3/0/7/130776266/dobuxunemozog-foxiregixikijew.pdf
    • http://rahimafroozips.info/uploads/1/3/0/6/130605306/2496016.pdf
    • http://realestatepianese.com/uploads/1/3/0/4/130476039/kuwavafami.pdf
    • http://jodhpurjammies.biz/uploads/1/3/0/7/130776525/xibugovove.pdf
    • http://themindfulchristian.net/uploads/1/3/0/4/130476372/606946.pdf
    • http://ucchk.org/uploads/1/3/0/3/130379307/powukul.pdf
    • http://liparents.org/uploads/1/3/1/4/131437715/1429410.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_off000056f6.bin
a5fd6a12986cf2dfa5771ca777953d3bed9d53848104d2f8fba1d293f4df2353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56F6 6924 bytes

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