Malicious PDF — malware analysis report

Static analysis result for SHA-256 771c5578bf505794…

MALICIOUS

PDF

207.3 KB Created: 2018-04-25 16:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-06-13
MD5: c8d2b4f245b58b316f9930f532dd6c16 SHA-1: 1d11c15ec2e94e5f6a65a62f2b15501dd5e91dc1 SHA-256: 771c5578bf5057943a5a3c456fd6193439304afd77091a0c297b3ad294ac2235
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic indicating it is an SEO redirector lure, specifically designed for phishing or free-download scams. The primary malicious URL identified is http://renimba.info/wp1?keyword=%D0%B3%D0%B4%D0%B7+%D0%BF%D0%BE+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B5+9+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BC%D0%BE%D1%80%D0%B4%D0%BA%D0%BE%D0%B2%D0%B8%D1%87+24, which is likely used to deliver a second-stage payload. No scripts were extracted, but the PDF structure and external URL point towards a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7668

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://renimba.info/wp1?keyword=%D0%B3%D0%B4%D0%B7+%D0%BF%D0%BE+%D0%B0%D0%BB%D0%B3%D0%B5%D0%B1%D1%80%D0%B5+9+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BC%D0%BE%D1%80%D0%B4%D0%BA%D0%BE%D0%B2%D0%B8%D1%87+24 PDF link annotation
    • https://nylppehoperc1980.files.wordpress.com/2018/04/lulenevog-forma-2ndfl-za-2014-god-skachat-blank-fizopoz.pdfIn PDF document text
    • https://boitididen1985.files.wordpress.com/2018/04/palir-angliiskii-iazyk-barashkova-5-klass-gdz-fewuzafebumiga.pdfIn PDF document text
    • https://sonstopbstagex1975.files.wordpress.com/2018/04/susarufanunaniz-kak-sdelat-sukhariki-retsepty-busolamilasovop.pdfIn PDF document text
    • https://alluhoscard1974.files.wordpress.com/2018/04/fufujevujezosa-gdz-po-prakticheskoi-rabote-po-khimii-8-klass-novoshinskii-xadukotanule.pdfIn PDF document text
    • https://alkrabhelra1974.files.wordpress.com/2018/04/gufoke-tvorozhnye-keksy-retsepty-video-mudowubajari.pdfIn PDF document text
    • https://niememapa1982.files.wordpress.com/2018/04/gutoxakedezusez-okruzhaiushchii-mir-3-rabochaia-tetrad-reshebnik-2-chast-pleshakov-wetazoga.pdfIn PDF document text
    • https://drowgeifrasce1988.files.wordpress.com/2018/04/notivejejuso-skachat-adb-rar-wurozev.pdfIn PDF document text
    • https://natejuggnber1976.files.wordpress.com/2018/04/pamok-skachat-papiny-dochki-torrentom-duselolomoj.pdfIn PDF document text
    • https://thibarpobe1983.files.wordpress.com/2018/04/dafavepari-gdz-po-angliiskomu-7-klass-tetrad-lovuwapad.pdfIn PDF document text
    • https://zdajicparvio1983.files.wordpress.com/2018/04/nujilor-ne-mogu-skachatb-na-android-pishet-nedostatochno-pamiati-noranek.pdfIn PDF document text
    • https://inpetfipen1982.files.wordpress.com/2018/04/ripepisidasof-kartochnyi-domik-1-sezon-6-seriia-skachat-jajadi.pdfIn PDF document text
    • https://golddocklange1971.files.wordpress.com/2018/04/depebamo-ege-po-russkomu-iazyku-chast-v-teksty-s-grammaticheskimi-zadaniiami-skachat-xoxovodem.pdfIn PDF document text
    • https://drowgeifrasce1988.files.wordpress.com/2018/04/xirujozinivil-gdz-angliiskii-5-klass-rabochaia-tetrad-nesvit-kufefidafazitus.pdfIn PDF document text
    • https://cirrgeekbgosen1984.files.wordpress.com/2018/04/xivekuvutolepag-rabochaia-programma-po-russkomu-iazyku-10-klass-korrektsionnoi-shkoly-8-vida-vogifasifaripub.pdfIn PDF document text
    • https://phaepreskingrumb1971.files.wordpress.com/2018/04/julepimulo-oge-fizika-bally-otsenka-2017-tozinowikukab.pdfIn PDF document text
    • https://golddocklange1971.files.wordpress.com/2018/04/depebamo-ege-po-russkomu-iazyku-chast-v-teksty-s-grammaticheskimi-zadaniiami-skachat-In PDF document text
    • https://cirrgeekbgosen1984.files.wordpress.com/2018/04/xivekuvutolepag-rabochaia-programma-po-russkomu-iazyku-10-klass-korrektsionnoi-shkoly-8-In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (font_00_sfnt_off0002dd0e.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000a48b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA48B 1485561 bytes
SHA-256: 1718db8b7c6a44712dc1b3acee434281abf7527ebf6ea299260c2277eb5af585
font_00_sfnt_off0002dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD0E 27828 bytes
SHA-256: be22305032e655fc90190b91869398dc5e1d3a36290d0abdd5d38f41671213c2
font_01_sfnt_off00031b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31B96 15760 bytes
SHA-256: 3a7c6a92fb505132e06c7c62a89e85bd7e323bc8e38b4f8e724c613a1ec03e00

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