Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ccfbb83636086e…

MALICIOUS

PDF

201.0 KB Created: 2018-04-25 17:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 91f93709a1b84154f632759903bef010 SHA-1: 1c3b123dc07d5129a85ef0ce905ac475f9c5c3f9 SHA-256: c7ccfbb83636086e400620a330f3fa4f7534c6c8e5419de2a8f5cdc97d05a977
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for an SEO redirector link, indicating a phishing or scam attempt. The embedded URL, 'http://renimba.info/wp1?keyword=%D0%B3%D0%B4%D0%B7+%D0%BF%D0%BE+%D0%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B5+4+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%87%D0%B0%D1%81%D1%82%D1%8C+1+%D0%BC%D0%BE%D1%80%D0%BE', is presented as educational material but likely leads to a malicious site. No scripts were extracted, but the PDF structure and URL suggest a social engineering attack.

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%BC%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D0%BA%D0%B5+4+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D1%87%D0%B0%D1%81%D1%82%D1%8C+1+%D0%BC%D0%BE%D1%80%D0%BE PDF link annotation
    • https://hoebelema1977.files.wordpress.com/2018/04/pisapinit-6-ndfl-obrazets-zapolneniia-forum-naxadugar.pdfIn PDF document text
    • https://busmaiduno1973.files.wordpress.com/2018/04/totatisavixev-neznaika-ege-po-khimii-9-variant-poxefanuke.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5910/5910134_xavapolnyikurspodgotovkikegeliteraturaledenevvamose.pdfIn PDF document text
    • https://img1.liveinternet.ru/images/attach/d/0//5909/5909393_nosoreshebnikpoangliiskomuiazyku3klassshkolarossiifeliki.pdfIn PDF document text
    • https://fettimicut1978.files.wordpress.com/2018/04/widajedojip-obuv-konspekt-po-poznavatelnomu-razvitiiu-starshaia-logopedicheskaia-gruppa-jubefali.pdfIn PDF document text
    • https://unkonebac1973.files.wordpress.com/2018/04/kodeg-kursy-dlia-podgotovki-k-ege-v-moskve-bawadiridil.pdfIn PDF document text
    • https://necnighnecar1986.files.wordpress.com/2018/04/gunajegugi-kak-pomeniat-melodiiu-zvonka-na-androide-5-vukuxexu.pdfIn PDF document text
    • https://dersraposgue1981.files.wordpress.com/2018/04/zorobomafokiw-gdz-po-geografii-6-klass-kartashova-kurchina-rabochaia-tetrad-mejovej.pdfIn PDF document text
    • https://thirsnanagtheo1974.files.wordpress.com/2018/04/jalew-tsiprofloksatsin-kapli-instruktsiia-po-primeneniiu-tsena-lakojiwonefu.pdfIn PDF document text
    • https://roundglenamen1970.files.wordpress.com/2018/04/lasini-czech-harem-torrent-mawof.pdfIn PDF document text
    • https://unazadbit1973.files.wordpress.com/2018/04/ponetenovafuru-vyshivka-ikon-biserom-skhemy-gaziwuremigu.pdfIn PDF document text
    • https://golddocklange1971.files.wordpress.com/2018/04/jusewabef-ege-po-matematike-s2-metod-koordinat-xerexol.pdfIn PDF document text
    • https://inpetfipen1982.files.wordpress.com/2018/04/someradabejibu-pesnia-o-mame-do-slez-skachat-dajen.pdfIn PDF document text
    • https://krisaradre1989.files.wordpress.com/2018/04/penabuxe-skachat-besplatno-pesni-kaifuem-segodnia-my-s-toboi-kaifuem-kidazev.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5910/5910590_zalujoxreshebnikzivigoldich7klassalgebramoxekor.pdfIn PDF document text
    • https://fettimicut1978.files.wordpress.com/2018/04/widajedojip-obuv-konspekt-po-poznavatelnomu-razvitiiu-starshaia-logopedicheskaia-gruppa-In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (font_00_sfnt_off0002c3b0.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_off0000a491.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA491 1485561 bytes
SHA-256: 1718db8b7c6a44712dc1b3acee434281abf7527ebf6ea299260c2277eb5af585
font_00_sfnt_off0002c3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3B0 28340 bytes
SHA-256: 5f15e7758b587daa46fdbee79b202736b76147efc2a1b4b56c525b532f261ae8
font_01_sfnt_off00030384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30384 15408 bytes
SHA-256: 0281ef25122c2c9c050c271d1421de477348ffc452e17b96bacd04b92cbd5589

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