Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ea241a29256c41…

MALICIOUS

PDF

194.3 KB Created: 2018-04-25 17:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8a5d7cb45bb98ca34c3ad70a3512c60c SHA-1: 2097e4d7690aa40c6bf204e25f335d559d13a907 SHA-256: 45ea241a29256c41e8d1205143a4236d2140abcccad738dd0d9f725bbe7e9c62
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9037

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=%D0%BC%D1%83%D0%B7%D1%8B%D0%BA%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B9+%D1%80%D0%B5%D1%88%D0%B5%D0%B1%D0%BD%D0%B8%D0%BA PDF link annotation
    • https://krisaradre1989.files.wordpress.com/2018/04/tapakulem-skachat-logo-dlia-kss-v-34-mozogiruwulifev.pdfIn PDF document text
    • https://folkwalatan1981.files.wordpress.com/2018/04/lolesejujegejis-russkii-iazyk-6-klass-ladyzhenskaia-reshebnik-1-chast-chitat-kozafa.pdfIn PDF document text
    • https://waticacom1985.files.wordpress.com/2018/04/pilafosarenuz-skachat-parkur-kartu-na-mainkraft-1-12-1-delariz.pdfIn PDF document text
    • https://alluhoscard1974.files.wordpress.com/2018/04/bewifikanisix-kupit-lenovo-ioga-buk-na-android-v-ukraine-junumuxapaxuke.pdfIn PDF document text
    • https://fettimicut1978.files.wordpress.com/2018/04/gezuwulut-soobshchenie-o-smeshannykh-lesakh-4-klass-tafigelere.pdfIn PDF document text
    • https://condokabe1985.files.wordpress.com/2018/04/javix-proshivka-dlia-telefona-mts-972-video-buges.pdfIn PDF document text
    • https://img0.liveinternet.ru/images/attach/d/0//5910/5910770_zovezoreshebnikpouchebnikupofizike8klassperyshkin2009sag.pdfIn PDF document text
    • https://sappbankpharluft1977.files.wordpress.com/2018/04/zudarudotewe-konstitutsionalizm-poniatie-i-soderzhanie-doklad-xutaxajukajafof.pdfIn PDF document text
    • https://thirsnanagtheo1974.files.wordpress.com/2018/04/sufowaf-draivera-na-printer-canon-mp230-dlia-windows-7-xesen.pdfIn PDF document text
    • https://folkwalatan1981.files.wordpress.com/2018/04/falozam-prigotovlenie-oreshkov-so-sgushchenkoi-video-retsept-taxefejofeko.pdfIn PDF document text
    • https://pupmerobesch1984.files.wordpress.com/2018/04/lisefikenifazo-ikhtiolovaia-maz-ot-chego-pomogaet-instruktsiia-pivuwumiduso.pdfIn PDF document text
    • https://amobaler1973.files.wordpress.com/2018/04/lopabegok-metodika-provedeniia-master-klassa-dlia-pedagogov-dou-sowotekimusute.pdfIn PDF document text
    • https://kaipinare1974.files.wordpress.com/2018/04/borajobixisefa-konspekt-uroka-vneklassnogo-chteniia-v-4-klasse-skazki-narodov-mira-begopusekabixa.pdfIn PDF document text
    • https://drowgeifrasce1988.files.wordpress.com/2018/04/tizetavo-biologiia-pasechnik-shvetsov-9-klass-gdz-latadukuwe.pdfIn PDF document text
    • https://taslowido1984.files.wordpress.com/2018/04/tetetekomazedug-minecraft-2-0-2-skachat-besplatno-pobexiwiro.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_off0000a46d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA46D 1485561 bytes
SHA-256: 1718db8b7c6a44712dc1b3acee434281abf7527ebf6ea299260c2277eb5af585
font_00_sfnt_off0002ac50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC50 27348 bytes
SHA-256: 10c69448b829a23499510ce313f3ba6a31bb95386ca1e5d9a7c6be6e17d2e22f
font_01_sfnt_off0002ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA16 15220 bytes
SHA-256: ca0a8421c6b6fec5cd84c1d1e153dfa284c02f82ed7b0e6004012904e055fb93

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