Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeafeb6e6246f595…

MALICIOUS

PDF

197.0 KB Created: 2018-04-25 17:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e77a0e500dc1ecb64d44a765f522b422 SHA-1: 7ab2f795c3d2b8906ffb27114f3303761da873d2 SHA-256: aeafeb6e6246f59536bd44e1ca571a06b5e830fd68f97098928dbf858722e44f
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to 'renimba.info', which is flagged as suspicious. The ML classifier also identified the PDF as malicious. While no scripts were explicitly extracted, the presence of an external URI with a keyword-rich query suggests an attempt to direct the user to a malicious site, likely for phishing or to download a secondary payload.

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%B5%D1%82%D0%B5%D1%80%D1%81%D0%BE%D0%BD+%D1%80%D0%B0%D0%B1%D0%BE%D1%87%D0%B0%D1%8F+%D1%82%D0%B5%D1%82%D1%80%D0%B0%D0%B4%D1%8C+4+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+3+%D1%87%D0%B0%D1%81%D1%82%D1%8C PDF link annotation
    • https://inpetfipen1982.files.wordpress.com/2018/04/gonosowaru-skachat-muzyku-iz-tantsy-na-tnt-3-sezon-webazexadojurox.pdfIn PDF document text
    • https://krisaradre1989.files.wordpress.com/2018/04/zujorilegada-msvcr71-dll-skachat-dlia-windows-7-x64-kuda-kidat-fisanitopazon.pdfIn PDF document text
    • https://spattamati1988.files.wordpress.com/2018/04/sulij-pismo-dedu-morozu-ot-rebenka-7-let-obrazets-wedetobotow.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5906/5906773_xodesskolkovsegopervichnykhballovvegepomatematikeprofildat.pdfIn PDF document text
    • https://thirsnanagtheo1974.files.wordpress.com/2018/04/vapevixo-dell-inspiron-1520-draivera-windows-xp-wifi-sivadinitoxi.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5908/5908142_jovuzgdzpobiologii5klasssoninrabochaiatetradfgosratimu.pdfIn PDF document text
    • https://tabrapoder1972.files.wordpress.com/2018/04/salokuvisu-zenitbet82-windows-tujidezikiv.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5906/5906173_subigdzpobiologii9klassrtkuchmenkobed.pdfIn PDF document text
    • https://niememapa1982.files.wordpress.com/2018/04/xunagifo-pandora-1870i-instruktsiia-po-ekspluatatsii-video-lijumetebaxi.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5910/5910685_tojudargdzpofizike10klassgmiakishevnen.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5906/5906159_pojosbornikgdzgeometriia7klassmerzliakrexu.pdfIn PDF document text
    • https://img1.liveinternet.ru/images/attach/d/0//5909/5909541_duvavkbiologiiaegebekav.pdfIn PDF document text
    • https://manryleramb1975.files.wordpress.com/2018/04/nekakasojenexi-gdz-obshchestvo-rt-8-kl-valur.pdfIn PDF document text
    • https://inpetfipen1982.files.wordpress.com/2018/04/jupejo-referat-na-temu-niuton-i-ego-otkrytiia-v-fizike-7-klass-tuvifu.pdfIn PDF document text
    • https://necnighnecar1986.files.wordpress.com/2018/04/jupuvidamejunug-kolybel-rima-skachat-torrent-polnuiu-versiiu-gifadi.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn extracted file (font_00_sfnt_off0002b5f7.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000a49d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA49D 1485561 bytes
SHA-256: 1718db8b7c6a44712dc1b3acee434281abf7527ebf6ea299260c2277eb5af585
font_00_sfnt_off0002b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B5F7 27032 bytes
SHA-256: 66312b07934a3457f48ffb38adb9f3cc0367440eecca346aa942cf4b0359eb91
font_01_sfnt_off0002f2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2A4 15716 bytes
SHA-256: 76091497f2ca3afedd9e70e3a29e104ecae172d04d0ab22010c7c9a722ee841f