Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a50829fadf07d4a…

MALICIOUS

PDF

195.1 KB Created: 2018-04-25 17:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-06-17
MD5: df7b0f87af5b5ffa832225541b675eba SHA-1: 69a5bb0f96e3dedd83b849ebeb01199a33aa4ae8 SHA-256: 3a50829fadf07d4ae91ac08c5ddf576aa82de660e1e2b2807b6a5d901c3a41df
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of the embedded URI suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9439

Heuristics 3

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=%D1%80%D0%B5%D1%88%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA+%D0%BF%D0%BE+%D0%B7%D0%B0%D0%B4%D0%B0%D1%87%D0%BD%D0%B8%D0%BA%D1%83+%D0%BF%D0%BE+%D1%85%D0%B8%D0%BC%D0%B8%D0%B8+10+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BA%D1%83%D0%B7%D0%BD%D0%B5%D1%86%D0%BE%D0%B2%D0%B0+%D0%BB%D0%B5%D0%B2%D0%BA%D0%B8%D0%BD PDF link annotation
    • https://rimervikab1977.files.wordpress.com/2018/04/lopab-platifillin-s-papaverinom-instruktsiia-po-primeneniiu-pubabeb.pdfIn PDF document text
    • https://inpetfipen1982.files.wordpress.com/2018/04/manuwiv-klubnye-treki-2016-skachat-besplatno-samye-fuzilukutalafu.pdfIn PDF document text
    • https://killhinlikid1987.files.wordpress.com/2018/04/bijerugezu-novye-pesni-na-poslednii-zvonok-2016-vystuplenie-1-klassa-simugikip.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5908/5908021_nuwinarusskiigdz8klassror.pdfIn PDF document text
    • https://digimvaze1975.files.wordpress.com/2018/04/nozebiw-kak-napisat-esse-po-obshchestvoznaniiu-ege-plan-i-primer-borarilizeruje.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5906/5906735_xilegdzpofizike11klassgendenshteinzadachnikotvetysuwikaz.pdfIn PDF document text
    • https://krisaradre1989.files.wordpress.com/2018/04/dovexesazas-pioneer-sc-lx73-instruktsiia-kanuwu.pdfIn PDF document text
    • https://vartoiprecfil1987.files.wordpress.com/2018/04/lemufanulale-reshebnik-po-angliiskomu-iazyku-v-p-kuzovlev-3-klass-bumof.pdfIn PDF document text
    • https://inpetfipen1982.files.wordpress.com/2018/04/winixuwefo-skachat-igry-na-samsung-besplatno-dlia-devochek-nipebesoneno.pdfIn PDF document text
    • https://digimvaze1975.files.wordpress.com/2018/04/pikipofezeminat-uskorenie-androida-bez-rut-prav-vakisisopeb.pdfIn PDF document text
    • https://img1.liveinternet.ru/images/attach/d/0//5907/5907163_dodugdzireshebnikpogeometriidlia7klassaavtoratanasianjolo.pdfIn PDF document text
    • https://rlinekabet1989.files.wordpress.com/2018/04/letupibike-reshu-ege-fizika-2017g-romogameb.pdfIn PDF document text
    • https://thibarpobe1983.files.wordpress.com/2018/04/popinemimi-kak-skachat-prava-root-wotazi.pdfIn PDF document text
    • https://reronessgel1985.files.wordpress.com/2018/04/masen-gdz-po-russkomu-10-11-klass-goltsova-shamshin-mishcherina-2014-rapiwuruzepolo.pdfIn PDF document text
    • https://inernutbang1982.files.wordpress.com/2018/04/foreluv-programmy-dzharvis-na-russkom-skachat-na-pk-tosuxijaligabod.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000a4b5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA4B5 1485561 bytes
SHA-256: 1718db8b7c6a44712dc1b3acee434281abf7527ebf6ea299260c2277eb5af585
font_00_sfnt_off0002add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADD2 27192 bytes
SHA-256: 9a44b3f90e7309141ac614b2ffe4b41e296ac16eddc72f6f75a9f4b5b9fd9968
font_01_sfnt_off0002eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB15 15700 bytes
SHA-256: 042bcd64606c2cc07c5f45f92969a7fd498da2488a20787b9b61f52e6747dc34

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