Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ada099c448a2ae…

MALICIOUS

PDF

79.5 KB Created: 2021-03-24 09:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 78610414e01480e7ee20c78f88f65e9f SHA-1: dd47af21a2f2d189bd35e6e44d780a51f5b3572c SHA-256: 77ada099c448a2ae5a2c630edee5633e35de7be157716fa16d60ad4fe9357732
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://leonvi.ru/wix?keyword=edtpa+instructional+materials+physical+education PDF link annotation
    • https://cdn.sqhk.co/seseniluvus/jAbjbCe/73317732617.pdfIn PDF document text
    • http://fedexonep.mypressonline.com/91512899220.pdfIn PDF document text
    • http://mandarins.space/fonuroxon1s36d.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/root_cause_failure_analysis_easa.pdfIn PDF document text
    • http://samejeno.iblogger.org/why_cant_you_integrate_sin2x.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/HaSZjhs/12715133259.pdfIn PDF document text
    • http://nufefabipiketod.22web.org/73218725244.pdfIn PDF document text
    • http://help-copyrighteamservice.com/loomis_method_downloadbsnhx.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/complete_mathematics_for_cambridge_igcse_extended_download77hb4.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/metimubixeziropupada8x7ho.pdfIn PDF document text
    • https://cdn.sqhk.co/rozopebak/n6r0scA/9795901227.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/90657896900.pdfIn PDF document text
    • http://marketop.club/58588119263kp2zm.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/KhdhOhc/rixasuxewatilawesikuwoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/693803ed-3968-4964-b673-b4ae6b803220/ap_biology_pre-lab_for_lab_5_cell_respiration_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2de18b-e94e-4d91-90fc-f6a22efa2be6/kyocera_print_driver_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aafd953d-73f1-40ee-8822-dd2a6a0b78f1/boxititetadanopijitani.pdfIn PDF document text
    • http://rolewafofe.epizy.com/zeledepovit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b19678c-7223-4c96-ba2e-488beb849c14/60131964592.pdfIn PDF document text
    • http://vimiromomekex.epizy.com/early_pregnancy_scan_report_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebde8d4-0db5-417f-aca8-1da95eba8cb7/how_to_fight_hand_to_hand_in_cyberpunk_2077.pdfIn PDF document text
    • http://vovijez.epizy.com/3356994857.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f044118-8523-4610-852c-e0e3aa7258eb/29220899196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1b85cc-edb2-444b-a5da-227097cc38aa/18798618874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2331ceba-d035-45ef-9ea1-f72f86aa95f2/6575201571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8ae393-5699-4a1b-919b-15c54516d83b/how_to_fix_a_big_buddy_heater.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 5372 bytes
SHA-256: a3cbecb65b70860a0b15298abf293c40046a428c3cdad82d6028cf6ae532b347
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 11228 bytes
SHA-256: 726076ed2403c471e02ba25ad08bbc3e4db86df69e589b2f60e4fbf6f9b90c3a