Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8d36248c39499b…

MALICIOUS

PDF

40.7 KB Created: 2020-06-07 06:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6aa1d71f4a4f38f0d148bae4752f9d0 SHA-1: 64cedde2095703f1f45cb93216be6e8a4355f90b SHA-256: 8f8d36248c39499b105ca00a59a1e4862e663dfe9942868d2958ba4477ffc391
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO abuse for malicious redirection. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are also present in the heuristic findings, suggesting the primary purpose is to drive traffic to these external sites.

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://mycalirado.com/uploads/1/3/1/3/131381607/131381607.html#kabbalah+herm%25C3%25A9tica+pdf
    • http://cardizard.com/uploads/1/3/0/7/130739540/9187012.pdf
    • http://senditsimply.com/uploads/1/3/0/6/130604641/zapapege-palejavaredowez-sujanibifowuno.pdf
    • http://tylerfalk.com/uploads/1/3/0/8/130813644/pijedamumifule-bilari.pdf
    • http://chandlerdoodles.com/uploads/1/3/0/8/130813903/f35899f43b9b15.pdf
    • http://hostmaster.kelynnpottery.com/uploads/1/3/0/4/130478009/2619439.pdf
    • http://alosanna.de/uploads/1/3/0/7/130740205/8654481.pdf
    • http://saverci.com/uploads/1/3/1/8/131857580/gepimekakobevij.pdf
    • http://susmitapaul.com/uploads/1/3/0/4/130476442/rufofifi.pdf
    • http://amazinglysassyevents.com/uploads/1/3/0/7/130776425/9158496.pdf
    • http://currypoint.net/uploads/1/3/0/6/130604249/fixigibukumunarab.pdf
    • http://thunderfunkpdx.com/uploads/1/3/0/3/130379336/rinijemukinom.pdf
    • http://roxannecoffey.com/uploads/1/3/0/4/130435784/469822.pdf
    • https://xuzubika.files.wordpress.com/2020/06/nukenilawafanilav.pdf
    • https://lujakizotur92264624.files.wordpress.com/2020/06/72815858740.pdf
    • https://kopenisof.files.wordpress.com/2020/06/28722232188.pdf
    • https://vekikilixowa.files.wordpress.com/2020/06/werikivadi.pdf
    • https://lilimiweko.files.wordpress.com/2020/06/bupikeson.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_off00007023.bin
ca810f1f5bdab4d7b56d24acceaa7321f909c64b96f663d4ce76a630e9717489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7023 11480 bytes

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