Malicious PDF — malware analysis report

Static analysis result for SHA-256 0912325b782bcd58…

MALICIOUS

PDF

80.1 KB Created: 2021-03-07 12:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: db3aed55132a577eb638af81a6d65d6e SHA-1: 33034382dcd8be8f7f6369bce2b75db3247866fd SHA-256: 0912325b782bcd589ad45b5b2b363e69db675e3e24ca11750b9adfd5eac36273
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including critical alerts for linking to known malicious redirectors and a high ML score. The embedded URLs, particularly the one pointing to 'crophysi.ru', are flagged as malicious redirectors. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=manual+de+calidad+ejemplo+definicion In PDF document text
    • https://cdn.sqhk.co/fexiseme/3KwD4ii/element_td_survivor_warcraft_3.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/4b8K7Tl/61213187675.pdfIn PDF document text
    • http://soxiwokix.iblogger.org/69976623492.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/igGLLjc/download_game_racing_car_fever_mod_apk.pdfIn PDF document text
    • http://sidesevofexow.22web.org/nujeviboz.pdfIn 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
    • http://pimubejat.epizy.com/69865310514.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_05fe2026693348ce8b5f6300aae8acb0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/amazon_app_store_on_android_box.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_a37951fbe40e4360a133b8a21ca38503.pdf?index=trueIn PDF document text
    • http://mafixatoje.epizy.com/78555022964.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_17e1da6009e9478583465575511af01f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/wifuturadogedu.pdfIn PDF document text
    • http://lufafutogixafu.rf.gd/how_many_miles_will_rav4_last.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_932cb893d9ba414cbe7a45caa95133e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c296d1-325c-404d-843f-e331ebebac13/64489560843.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/90770209245.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/18784986378.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_96cf6bdef40d42cd84057238d5772e64.pdf?index=trueIn PDF document text
    • http://mokimonanogi.rf.gd/73287506849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea94aa52-1601-4487-8a7b-26c108c0f5a7/leadership_styles_and_conflict_management.pdfIn PDF document text
    • http://riwekijeworore.rf.gd/words_to_ive_got_sunshine_in_my_pocket.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/sword_art_online_light_novel_volume_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e9f407-1bd9-4bb9-9e69-e455b67cab7c/25442423319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/946e2caa-ab50-4a10-be81-e7e0e8b89744/navy_instructor_evaluation_sheet.pdfIn PDF document text
    • http://zuwewabarabin.epizy.com/chemical_engineering_thermodynamics_8th_solution_chapter_10.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 4912 bytes
SHA-256: 307848cd0668e7e2c9f23652f27e20cf1a515f30a04760a512e717fe03204f3c
font_01_sfnt_off0000fd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4E 11540 bytes
SHA-256: 6413126a968203ab2392b8f3f65b00f4d4bc9fd65aca1b9764ece381bbd0891b
font_02_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3