Malicious PDF — malware analysis report

Static analysis result for SHA-256 8200461810bb5e1a…

MALICIOUS

PDF

70.2 KB Created: 2021-02-28 09:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b649f507eb248a6ec244783c37b89ddd SHA-1: 70e6628e6b40f0f163742f3e70ca76832c019b2e SHA-256: 8200461810bb5e1aa474a819ae695cd52a55d46a335d1a285b9f70152fd0abaf
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a remote-support tool lure, instructing the user to install such software. An external URI was found pointing to a suspicious domain, likely serving as a download or C2 server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://jumiwimov.ru/123?utm_term=is+mother+nature+a+proper+noun
    • http://mavigawika.scienceontheweb.net/marketing_plan_executive_summary_ppt.pdf
    • https://cdn.sqhk.co/tobepeliv/QES1Jhf/messenger_download_for_android.pdf
    • http://zaxobus.iblogger.org/41334438389.pdf
    • http://wotidoteked.mywebcommunity.org/marantz_sr6009_4k_hdr.pdf
    • https://cdn.sqhk.co/vatomepipiw/Bjhhdhg/bike_racing_games_for_free_download.pdf
    • https://cdn.sqhk.co/wobuwaseja/eqikYgi/90514504347.pdf
    • http://dilurijarejo.22web.org/anydesk_software_free_filehippo.pdf
    • https://cdn.sqhk.co/noluxokeruma/bicoKhh/16417311683.pdf
    • http://vanimerukaguto.scienceontheweb.net/kalender_pendidikan_2016.pdf
    • https://cdn.sqhk.co/natokaze/jhigajf/bruce_buffer_it_s_time_audio_download.pdf
    • http://jadogaxarabu.mygamesonline.org/bonovovavap.pdf
    • http://gifozazupu.iblogger.org/koreader_android_slow.pdf
    • http://sumagezemorewo.22web.org/vibikuvafuwupep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://viwefar.rf.gd/what_is_the_best_saying_about_love.pdf
    • http://toviliguzufefiv.rf.gd/how_much_was_the_first_telephone_in_1876.pdf
    • http://lajuloverebob.epizy.com/70886512321.pdf
    • http://godorapibiveze.epizy.com/5th_edition_monster_by_cr.pdf
    • http://zutugidod.onlinewebshop.net/is_ice_breakers_gum_bad_for_dogs.pdf
    • http://sipanokule.onlinewebshop.net/kosutozevosexaru.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_off0000cb91.bin
10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 2900 bytes
font_01_sfnt_off0000d5d4.bin
16fea08d990c77d4c2aadc656b995a8d85b8a9c54f76a84be5735bc100274e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 4964 bytes
font_02_sfnt_off0000e685.bin
3ea4f03e1f958d879d064213495c9804493b84f9d339b6418bc72dd07485f486		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE685 10736 bytes

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