Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d28938ba635a73…

MALICIOUS

PDF

73.8 KB Created: 2021-04-20 17:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8892a6e4581d01fec476e7adf734d5e0 SHA-1: 7efcd85ec6e18027444c539e8f26e6ed3e628a9b SHA-256: 25d28938ba635a73c898ff607dabac4ca593d3313094716b6cf14a5db5fe0e8b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to zajinet.ru, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a song title, likely serving as a lure. No scripts were extracted, but the presence of many external links and the overall detection profile strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zajinet.ru/strik?utm_term=do+you+want+me+country+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454673/normal_6064f121033a3.pdfIn PDF document text
    • https://juwulonureli.weebly.com/uploads/1/3/2/8/132815178/1245005.pdfIn PDF document text
    • http://suvonenexazu.mywebcommunity.org/zefazejebepidadav.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/los_atributos_de_dios_arthur_pink.pdfIn PDF document text
    • http://worameruvejaka.mywebcommunity.org/anatomy_trains_myers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_602f89baf1ece.pdfIn PDF document text
    • https://gusoberususot.weebly.com/uploads/1/3/1/4/131454899/5fb68f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_605143e5ae9ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_606e6692a528b.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/vujaxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_604cdf4334546.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/antibiotic_resistance_statistics_2020.pdfIn PDF document text
    • http://dulexip.22web.org/wemoje.pdfIn PDF document text
    • https://gabofulonu.weebly.com/uploads/1/3/4/7/134730366/3947892.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojozija.onlinewebshop.net/yoga_mudrasana_steps_and_benefits.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_53d2ce76bf0447e394f813ca6bb15be7.pdf?index=trueIn PDF document text
    • http://rovigugidolu.epizy.com/air_entraining_admixtures.pdfIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_98bdbd950b1946938f4b69dc9ba5b2d9.pdf?index=trueIn PDF document text
    • http://zuruxiwowasigu.epizy.com/jeduzijebowumedewaxovu.pdfIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_fa46df6699bc4facbb4bbec2e1f3ac9b.pdf?index=trueIn PDF document text
    • http://tosivasode.epizy.com/what_are_some_negative_words.pdfIn PDF document text
    • http://nufolupi.epizy.com/56936621105.pdfIn PDF document text
    • http://fabodatutowew.epizy.com/metedewazijikifidumoma.pdfIn PDF document text
    • http://rafodize.rf.gd/reporting_ancova_table_apa.pdfIn PDF document text
    • http://xakafof.rf.gd/12193750582.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_11a5a7d8f04349a7927032a3ebfe2abe.pdf?index=trueIn PDF document text
    • http://xatudoxi.epizy.com/koine_sheet_music.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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 5280 bytes
SHA-256: 81e0f9f2ea3538ff8939fbd0aa39f19515c8006d5927243dd8768846015e6c60
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10760 bytes
SHA-256: 984c732e397a78b22bdb4def554f6397635542b19f1423f11ca36954b532c3ce