Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43c6cda628b59ae…

MALICIOUS

PDF

81.1 KB Created: 2021-03-09 22:01:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db5c7a8f49b77b5b61be821a26c58d53 SHA-1: 19c751d2632e185726a650a63c06a448dd7ba5b4 SHA-256: c43c6cda628b59aed867de1b88fd1a4bc31a72695db61cea71b9927541e81ca8
184 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. While the document body is heavily obfuscated, the presence of malicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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/123?utm_term=t%25C6%25B0+v%25E1%25BA%25A5n+mua+android+tv+box+tinhte In PDF document text
    • http://dekupedatibidal.iblogger.org/tuvemowafid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_6011aca92de9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_602a528610c50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_602a52681c898.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/boss_up_book_download.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/55995717490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416930/normal_5fc63cbeb6bcc.pdfIn PDF document text
    • http://fotobaruti.22web.org/rodovudobugadawofavasufeb.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/23289914565.pdfIn PDF document text
    • http://nekidifuton.medianewsonline.com/pattern_oriented_software_architecture_volume_1.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/7f9591de-6615-44a1-b46b-df102519a945/how_many_calories_are_in_a_taco_bell_crunchwrap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77713719-2951-4388-b0c0-052b4987ded4/zujigibuneje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903c459e-13a2-45ec-bf33-e752265cb9dd/zefipabolufipomilon.pdfIn PDF document text
    • http://girodolud.rf.gd/warhammer_undead_army_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597e869f-7e26-422a-b0db-8ece53da32e6/35825380959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bec399f0-b65f-4c80-b9c9-cae891e02bd2/23547602907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d0dd5f-73a1-4aa7-ab05-56b7b52635b5/canon_eos_digital_rebel_xt_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d211f8fb-fd61-4be6-a1ff-b735c6222e87/software_product_development_life_cycle_stages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e568f7-bde4-42d1-abc0-5003c0cae3b5/car_air_conditioning_leak_repair_cost_uk.pdfIn PDF document text
    • http://gisaxuzarufol.epizy.com/1854953216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94fbea29-3fc4-4f0e-8de9-097590d2450c/a_series_of_unfortunate_events_movie_cast_sunny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76a8b00-92fd-4a4a-b978-20ddea98dcbf/vajuxaro.pdfIn PDF document text
    • http://varebifadilo.epizy.com/how_to_play_live_wire_tabs.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/how_to_factory_reset_plantronics_backbeat_fit.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_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 3256 bytes
SHA-256: bd4e28a4a881e47d2eb33894c0ec296bfbc3488820e190ca871164addbb1d3f8
font_01_sfnt_off0000fecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECB 5468 bytes
SHA-256: ea72f0a4d19afb811461a3333b6aa23ccc23b8c0fcfa5e87c60004a967f09c8f
font_02_sfnt_off00011095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11095 10544 bytes
SHA-256: f2964e05b6ed6aa6fdb979ad5df6ff4e16f210129094a219153b815cac8850f3