Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d9aef8e96d581f…

MALICIOUS

PDF

85.9 KB Created: 2021-05-15 11:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 46f217b88f2490c3d01f193ea9c8364b SHA-1: e05245511f140873d832c56095cca931fab12910 SHA-256: 90d9aef8e96d581ffe98f0979ac638312b8aa77d67fbc9e97c7e557aa32b0bb4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and a primary URL that appears to be part of a link farm designed to redirect users. The presence of these URLs and the heuristic indicating a link farm strongly suggest 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
  • 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://soxebez.ru/strik?utm_term=what+do+you+feed+daphnia+culture PDF link annotation
    • http://jutidewolojura.mypressonline.com/kowopesiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469834/normal_5fefecc95e5ad.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/pobikovojidup.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/hygiena_ensure_touch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466153/normal_5fc69e85e554b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_6052ef6b44bde.pdfIn PDF document text
    • http://metarapuw.mypressonline.com/small_steps_to_giant_improvement_download.pdfIn PDF document text
    • http://botefin.medianewsonline.com/simple_present_exercises_autoenglish.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_60382619cff3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_604e42455ffb5.pdfIn PDF document text
    • http://nomudepalak.medianewsonline.com/kaxedesezozolatiwok.pdfIn PDF document text
    • http://xafukuxovikovu.22web.org/cost_reimbursable_contract_template.pdfIn PDF document text
    • http://novofikupeneda.mywebcommunity.org/95450388469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_6025c9aee7934.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/13924532850.pdfIn PDF document text
    • http://fatogotem.22web.org/42204176830.pdfIn PDF document text
    • http://vujakaz.iblogger.org/cuisinart_classic_toaster_oven_broiler_tob-30bw_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_600a063c5eb5c.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://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_b96b33659fe4431c81dba19cad0c840b.pdf?index=trueIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_c417c8e08dbe475da7015296d3429fba.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/perdona_si_te_llamo_amor_2014_youtube_pelicula_completa.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/29344510891.pdfIn PDF document text
    • http://pomagupivedib.epizy.com/13996566729.pdfIn PDF document text
    • http://bakotisimipivok.rf.gd/metformin_lactic_acidosis_treatment_guidelines.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_955e697224ec4868add187cda42b2106.pdf?index=trueIn 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_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 5064 bytes
SHA-256: b61d7a56dc3e921d98e1627c8d319a00ad1732a58bf6188c67f26a61c5c9f075
font_01_sfnt_off00011525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11525 11312 bytes
SHA-256: a1041ce156073708a37fa88c6b8b0eaf542e92e1850083e0048bb3bc86ef04d8
font_02_sfnt_off00013a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A28 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2