Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5986d1398b298b…

MALICIOUS

PDF

77.9 KB Created: 2021-03-10 12:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d5d812d9cb7dc60cc85f460143ecd40 SHA-1: e89fd3ac0fc43f5bdb5dea90de20d0311b783db6 SHA-256: de5986d1398b298b87a07013660ae811bf36aef2d570ea41a43cac306cf73330
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URIs, with one pointing to a suspicious domain ('botokaw.ru') that is likely part of a phishing or malware distribution scheme. The PDF's structure and the presence of multiple links on disposable hosting suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 https://botokaw.ru/123?utm_term=3d+bovine+anatomy+apk
    • http://rajajime.mypressonline.com/71935351807.pdf
    • http://vanimerukaguto.scienceontheweb.net/veterinary_anatomy_coloring_book.pdf
    • https://cdn.sqhk.co/gizoxemovefi/58jhyjb/52102597880.pdf
    • http://volulolusawaz.mygamesonline.org/capites_do_brasil_a_saga_dos_primeiros_colonizadores.pdf
    • http://zotuvogilisori.iblogger.org/panasonic_plasma_tv_power_light_blinking_8_times.pdf
    • http://bejawutipage.mywebcommunity.org/dell_b1160w_toner_staples.pdf
    • https://cdn.sqhk.co/juvokapo/HNmgJif/ffxiv_white_mage_leveling_guide_shadowbringers.pdf
    • http://vadosaj.getenjoyment.net/pekusa.pdf
    • http://befotuke.mywebcommunity.org/how_to_fix_zoom_video_not_working.pdf
    • http://xufelaketodo.getenjoyment.net/how_to_verify_iso_27001_certification.pdf
    • https://cdn.sqhk.co/zimopaji/Gpjehbb/foxycraft_download_for_pc.pdf
    • http://rawoxaxevog.mygamesonline.org/reading_techniques_for_struggling_readers.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://betudurinipop.epizy.com/hursthouse_on_virtue_ethics.pdf
    • http://gijomifede.rf.gd/dufosivetitukidurupumuzo.pdf
    • http://jowosos.myartsonline.com/17700079521.pdf
    • https://s3.amazonaws.com/sowewazulejewi/2221304107.pdf
    • http://pivimufe.atwebpages.com/prologue_to_the_canterbury_tales.pdf
    • https://s3.amazonaws.com/juzowilipi/73061495429.pdf
    • http://palelezugob.onlinewebshop.net/what_do_bbc_weather_icons_mean.pdf
    • http://buvumitibeve.rf.gd/dcss_guideline_calculator.pdf
    • https://s3.amazonaws.com/dosalapasenow/backtrack_5_hacking_tutorial.pdf
    • https://s3.amazonaws.com/tolivajupeku/infrared_camera_buying_guide.pdf
    • http://ridimonaf.rf.gd/1991583678.pdf
    • https://s3.amazonaws.com/zazelujeju/anthem_cataclysm_guide_map.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61b.bin
a47d11a349d502f7a3b1c32409d7863306f2f90069300ca1602813cb0d44d48c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 1616 bytes
font_01_sfnt_off0000ee4f.bin
104c0c4bf0530db479784fe50e19dcf868401623ddbd71f7bfe94703061a3d14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5236 bytes
font_02_sfnt_off0001001a.bin
23467427e977552cdb8a27da4026a0c22b102af19558831dc38105666fc56a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 14920 bytes

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