Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e07b3b9ca48398d…

MALICIOUS

PDF

74.0 KB Created: 2021-06-03 19:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53d6b8930a74348566d6a72f5fc86232 SHA-1: 72c011a5b3312c1893805fa57bae6b96b5deb658 SHA-256: 1e07b3b9ca48398dfc8d2542ae07e296f9cc7efd070c4bb3506ceddc0e114ead
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crewmak.ru/pbw?utm_term=yeezy+700+do+they+run+true+to+size
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/4680746.pdf
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/2591954.pdf
    • https://ponamuti.weebly.com/uploads/1/3/4/5/134513888/logolaxedal.pdf
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/doxomomej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sorawako.pbworks.com/w/file/fetch/144469353/dimukosozu.pdf
    • http://detomipipu.pbworks.com/w/file/fetch/144556224/how_to_make_activated_copper_nms.pdf
    • http://pokuwatosat.pbworks.com/f/31576800143.pdf
    • http://gitefov.pbworks.com/f/problemas_multiplicar_por_10_100_y_1000.pdf
    • http://ruwomodanom.pbworks.com/f/zefugoze.pdf
    • http://rimikupababo.pbworks.com/w/file/fetch/144546144/new_punjabi_love_ringtone_2020_download_mp3.pdf
    • http://pigedigasexu.pbworks.com/f/wepubanapizugebasemilak.pdf
    • http://poforezufovu.pbworks.com/w/file/fetch/144434388/naruto_shippuden_ultimate_ninja_impact_ppsspp_download_100mb.pdf
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426855/gta_san_andreas_cleo_mod_apk_v2.00.pdf
    • http://pimepovume.pbworks.com/w/file/fetch/144481302/63357896034.pdf
    • http://magogopowo.pbworks.com/f/is_dish_network_good_for_gaming.pdf
    • http://xuruzinijub.pbworks.com/f/gevefawugijedivusasub.pdf
    • http://fokojifidesi.pbworks.com/w/file/fetch/144505272/what_are_some_limiting_factors_of_photosynthesis.pdf
    • http://jesababa.pbworks.com/w/file/fetch/144425196/6022101002.pdf
    • http://giribuv.pbworks.com/w/file/fetch/144543357/can_exposure_to_mold_cause_tonsillitis.pdf
    • http://natutaliva.pbworks.com/f/ppp_lesson_plan_example_tefl.pdf
    • http://pupowivala.pbworks.com/f/vajaminegadamanajat.pdf
    • http://numefen.pbworks.com/f/how_to_beat_level_73_on_gardenscapes.pdf
    • http://fisukafetif.pbworks.com/w/file/fetch/144425640/seiko_sportura_instruction_manual.pdf
    • http://kelivesas.pbworks.com/f/how_do_i_use_my_sq11_mini_dv_camera.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e274.bin
5fddda29f7b6a8dcbd266c61d56c29f4648f117a04807f99b812cef344a1a640
pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 5008 bytes
font_01_sfnt_off0000f38f.bin
09ea4909a37cad6fcb447482771a688f93639d021afe3db35cb571c484afc604
pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 11340 bytes