Malicious PDF — malware analysis report

Static analysis result for SHA-256 3447d1fb25b6bfed…

MALICIOUS

PDF

80.9 KB Created: 2021-03-15 00:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 26ce197019852efc97b0ca88f5b24f0f SHA-1: 1ee33f5c86d58f04767c937adbf888078b85b1ad SHA-256: 3447d1fb25b6bfedb7132252cb49a3a3076cae648028abb15286e5d213d6c5df
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to download software. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into downloading potentially unwanted or malicious applications.

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://kuzutuzo.ru/wix?keyword=download+nova+launcher+beta+apk PDF link annotation
    • https://cdn.sqhk.co/zevukodixu/fWNjhzl/car_driving_simulator_2016_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/hiiWWWX/80984390369.pdfIn PDF document text
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/wejelojo-torez.pdfIn PDF document text
    • http://kosiwixiwumizu.iblogger.org/rubber_stamp_templates_free_psd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_5fd350c484349.pdfIn PDF document text
    • http://debesur.iblogger.org/77581207632.pdfIn PDF document text
    • http://kigurumi.org/76721508646vm6hn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477183/normal_5ffc895e05f5b.pdfIn PDF document text
    • http://antinomi.design/app_polaris_office_viewer_51y0wb.pdfIn PDF document text
    • http://huaweistoreukr.xyz/how_to_oil_clockrz5qa.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/7243906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_6033f8e41b94b.pdfIn PDF document text
    • https://rudiwiguxovo.weebly.com/uploads/1/3/5/3/135317070/a973f101086.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/miwos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_6046be838a751.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_5fe9130274095.pdfIn PDF document text
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/texamipisoki.pdfIn PDF document text
    • http://appless.space/fisher_wood_stove_instructions17nad.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://sobogasitizi.epizy.com/a_format_of_informal_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c5e794-45f8-40ad-adbb-eef7c0e6e694/soundlogic_xt_bluetooth_speaker_pairing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf204b4e-12c8-4857-88a6-10231a31955b/fedisawuzelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dc78e4-0c83-4aad-9564-f3c3367e8d43/kodejajajizufen.pdfIn PDF document text
    • http://bexumasifawej.epizy.com/formal_grievance_procedure_definition.pdfIn PDF document text
    • http://farilofisimoru.rf.gd/tv_toshiba_32c110u_precio.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_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 5172 bytes
SHA-256: 9921e0f6edacf9b8b08d54abb1b9edd0defb136273b93450d0d5ef315b3d6a8b
font_01_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 11328 bytes
SHA-256: 1a47231ccfdad373fbc0ffd8bca3e2d72812f12e6bce7de139658a1a568b1832
font_02_sfnt_off000127ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127ED 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361