Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e8dc614c374901…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 20:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: ac2bbad144e907f3b464cd986b581971 SHA-1: 2c0d689c87915949f0d33777a84ff2e0bbb0c56b SHA-256: 24e8dc614c374901e5bc47f216652396f452a4aa18f94ba1d3b5140bbdf432ad
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Assam tet 2020 guide book pdf'. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://lozipotod.ru/award?keyword=assam+tet+2020+guide+book+pdf PDF link annotation
    • https://cdn.sqhk.co/jasorevujoxu/cjhhhMU/xogafijajufosejer.pdfIn PDF document text
    • http://fawakosiki.22web.org/vector_sums_magnitude_and_direction_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/ajh1ihB/23853621032.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/hcljxgA/youtube_top_hits_2010_playlist.pdfIn PDF document text
    • https://cdn.sqhk.co/zujijivopuju/7gg4DWd/kapafirufeja.pdfIn PDF document text
    • http://obzorov.site/cynthia_slam_poetry_tik_tok7pkau.pdfIn PDF document text
    • http://mnogolidov.xyz/colnago_bike_sizing_guideo8hdn.pdfIn PDF document text
    • http://dumagut.22web.org/27869977911.pdfIn PDF document text
    • http://opendouche.xyz/what_does_child_led_play_meanen263.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/ijpgdij/highway_car_racing_3d_mod_apk.pdfIn PDF document text
    • http://martans.space/177178426522lsal.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/QhhLibN/jenoduramogeporosi.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/khfmNhh/hotword_changer_for_assistant_free.pdfIn PDF document text
    • https://cdn.sqhk.co/rorazelesu/fhhsjus/diamond_clicker_for_free_fire.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/how_to_program_directv_remote_rc66rx_to_dvd_playery7bkw.pdfIn PDF document text
    • http://jedadenawesezo.iblogger.org/79711373591.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rorives/sowokibigudikolujako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99fac583-4263-4f32-9bbd-af2ea9ba2ebb/how_to_be_a_good_leader_teamwork.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d712a2-9cfe-4ff2-b57f-a0861d1d675d/botawimuxuzubujaf.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/toxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/nufoxubotugomasatonetu.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/burst_lisp_autocad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 1528 bytes
SHA-256: 906312b206573a369fdf05f2d58baf7f592464f3d990fc278d772a9a6a9aa3be
font_01_sfnt_off0000eece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 5476 bytes
SHA-256: e4da348e69c387eb7f532936ea61c028d9a9ecd971f14c7128aa28a7c71ae68e
font_02_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 10824 bytes
SHA-256: bc126e0864357035459af3cf07d2f511f370be2af37a40ff53c1d0dff28f0be9
font_03_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34