Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ee90e7acfde367…

MALICIOUS

PDF

79.7 KB Created: 2021-03-09 01:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 91e190ba7c67c9d946d5b6822ced9604 SHA-1: 99dab6affac441164d5c4f8de31f7ec2a4c1d8f7 SHA-256: c6ee90e7acfde3678a8f02f703b950620bedf01f70c7ceeb6c61a5703cb4c8b5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, including one that appears to be a lure related to 'blood cancer last stage report images'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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
  • 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://seumenha.ru/123?utm_term=blood+cancer+last+stage+report+images PDF link annotation
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/2545771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417535/normal_6026229636444.pdfIn PDF document text
    • https://tevidozeji.weebly.com/uploads/1/3/4/8/134887032/puvat.pdfIn PDF document text
    • https://seduzitatadobi.weebly.com/uploads/1/3/4/3/134371103/tudazerilav.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/fAEghMH/vetigadozeru.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/jdStPja/nusifobera.pdfIn PDF document text
    • http://vivofuma.66ghz.com/tetanus_prone_wound_guidelines_uk.pdfIn PDF document text
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/2511887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483591/normal_5fc61f2f1756a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367290/normal_5fe58fd949451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_5fd34ed9f1ab1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481163/normal_5fe0593d70b29.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/28d10700.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/Tiemhjh/86485202566.pdfIn PDF document text
    • https://rirejanumaxix.weebly.com/uploads/1/3/4/6/134631236/figamazuvejifi.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
    • https://uploads.strikinglycdn.com/files/23e35746-95f7-4217-a549-87c90b968494/8007277716.pdfIn PDF document text
    • http://gavojomizam.epizy.com/c_p_u_ki_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf274cc0-9ffb-4872-a10a-0f3b6661ee11/descargar_drivers_para_acer_aspire_one_zg5_windows_xp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdead4a5-cc32-441f-950a-49cb58405fbc/81580660164.pdfIn PDF document text
    • http://tudozujuxijoz.rf.gd/gisowuwegakikipare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab55ebed-6ca6-41ca-a254-e3aaad1fa317/cdr_data_analysis_software_free_download.pdfIn PDF document text
    • http://faluzarawajuxos.epizy.com/22294908239.pdfIn PDF document text
    • http://bojakufuxelev.epizy.com/the_secret_life_of_pets_2_larry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d499188e-1c65-4040-a38e-1d2f7c649d02/how_old_is_percy_jackson_in_book_1.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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5228 bytes
SHA-256: f82095d20dd3944245ff4cbb51a96c85c44b0a6c48e2a073a13405306228d4cb
font_01_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 10684 bytes
SHA-256: 40f0ea7fc4e125f60b7979abfaa6bb5761e945f66dfd369bc38465032cd1de47
font_02_sfnt_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2