Malicious PDF — malware analysis report

Static analysis result for SHA-256 551b71cc8269ed02…

MALICIOUS

PDF

185.7 KB Created: 2015-07-23 01:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.2.1 (via Qt 4.8.6) First seen: 2020-09-24
MD5: bc26566c19fd712c490821252896b1ba SHA-1: bfed52314f3131662bf06c2e8ebfb1bf5d786573 SHA-256: 551b71cc8269ed021abcce836ca5610e84c85f3a3ed471445d347fa2247a68d4
74 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains an embedded URI pointing to a suspicious domain, ruqvarq.ru. This suggests the document is intended to redirect the user to a malicious site, likely for phishing or malware distribution. No scripts were extracted, limiting further analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 3

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ruqvarq.ru/?b1Ls&keyword=%D0%BB%D0%B0%D0%B4%D0%B0+%D0%BA%D0%B0%D0%BB%D0%B8%D0%BD%D0%B0+%D1%81%D1%85%D0%B5%D0%BC%D0%B0+%D1%8D%D0%BB%D0%B5%D0%BA%D1%82%D1%80%D0%BE%D0%BE%D0%B1%D0%BE%D1%80%D1%83%D0%B4%D0%BE%D0%B2%D0%B0%D0%BD%D0%B8%D1%8F&charset=utf-8 PDF link annotation
    • http://fastpic.ru/In PDF document text
    • http://www.liveinternet.ru/clickIn PDF document text
    • http://img1.liveinternet.ru/images/attach/c/5//4183/4183194_kursovoy_proekt_po_vodosnabzheniyu.pdfIn PDF document text
    • http://img1.liveinternet.ru/images/attach/c/5//4183/4183176_lazer_iz_dvd_privoda_shema.pdfIn PDF document text
    • http://img1.liveinternet.ru/images/attach/c/5//4183/4183178_kuryatnik_proekt.pdfIn PDF document text
    • http://www.microsoft.com/typography/fonts/In PDF document text
    • http://www.microsoft.com/typography/fonts/YouIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000242dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242DD 3556 bytes
SHA-256: d1595540fb3e23ad096dafc23ca1eba10b79c546cadf6b381c45a8159f290a0a
font_01_sfnt_off00025061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25061 14560 bytes
SHA-256: 4bbb52be26463adc3ccdff8fc5ff1c84a2f0fc0d170d4ac6f3ce75ca819324ae
font_02_sfnt_off00027de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27DE1 14532 bytes
SHA-256: cf2320a60bd9246f5a6532ceea4d756e1ebc205694ec4c6b55b969c93b6fbd3c
font_03_sfnt_off0002a8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A8D4 6952 bytes
SHA-256: 486ed1ec61c539ff9c965f1f0e803abe4f494bddb3969a06f6f7d2e5ed93fa72
font_04_sfnt_off0002bd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BD0B 5952 bytes
SHA-256: b60b99c35d16e9446c7ed3f272fd771d8971b7f591ec57d07ea048484f01a25c
font_05_sfnt_off0002cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC7B 3752 bytes
SHA-256: 9364d8c42993f0db1eb41a63b15a48dd56cef5056a611ab8e91dd81183a5a95e

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