Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bd837f68bbdc34…

MALICIOUS

PDF

40.0 KB Created: 2020-05-19 15:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c9c2908ace48a61cccfd0cf7090856 SHA-1: 651f9dc6896141f2116e5cbaa55cc83342fe21ce SHA-256: 99bd837f68bbdc348106fbf9ce5d2d25e2ddb8f614520a057810c58efcce4af3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to further malicious content or phishing pages.

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://narpestakpak.com/uploads/1/3/0/8/130873914/130873914.html#o+evangelho+de+maria+madalena+completo+pdf
    • http://aerialadvantagepoint.com/uploads/1/3/0/6/130639547/1911487.pdf
    • http://purelifelvpropertiescom.com/uploads/1/3/0/8/130874364/sixedam_jefulemel.pdf
    • http://nutribreast.com/uploads/1/3/0/5/130543333/jafopopubaxumekul.pdf
    • http://twinkletoespetcare.com/uploads/1/3/0/6/130621533/kekunifafu.pdf
    • http://tinokunda.org/uploads/1/3/1/3/131383975/mejamax.pdf
    • http://outdoorsactivewell.org/uploads/1/3/0/7/130739371/9696890.pdf
    • http://ashamandela.com/uploads/1/3/0/8/130814784/608db39f21ab22.pdf
    • http://suitlandhsfeasibilitystudy.com/uploads/1/3/1/3/131379671/0aaa617ed2a.pdf
    • http://winandchocolate.com/uploads/1/3/1/3/131382590/379817.pdf
    • http://luliudesign.com/uploads/1/3/0/6/130620690/fatuxidiramizase.pdf
    • http://fastestwaytoloseweightsystem.com/uploads/1/3/0/6/130621114/jufotutewit_mazeso.pdf
    • http://dauphinkom.ca/uploads/1/3/1/4/131437980/juzobusakodoxa.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_off00006c90.bin
e99930c23d639f8edf911c7c35647fe82c365dd725e5f1bf278206726ad36fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C90 12596 bytes

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