Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28eb269a3bfb1cc…

MALICIOUS

PDF

74.1 KB Created: 2021-03-20 10:47:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f196953f1177e33b2f4d4e0fc1556825 SHA-1: ef1435fad3c1b9df15ae670bf88fb276bf1499b0 SHA-256: e28eb269a3bfb1cc1d2a465a3866d088c1bd8bb6ad432b76526ded340e3125d2
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=personal+ecological+footprint+worksheet In PDF document text
    • https://xuporavima.weebly.com/uploads/1/3/4/3/134363981/fa17d9c.pdfIn PDF document text
    • http://wunowixumofe.22web.org/ayyappa_bhajan_songs_in_telugu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489041/normal_5ffdbf3f5ac0a.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/ji398ii/fivestar_bank_customer_service.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392199/normal_604d23b321bc1.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/fGgiCk1/27941441039.pdfIn PDF document text
    • http://zimipamus.22web.org/jinovaridenilodef.pdfIn PDF document text
    • https://cdn.sqhk.co/jizesusaxeta/Ejcgegf/netflix_stock_split.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd8a08c68a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471273/normal_60059e24505c2.pdfIn PDF document text
    • http://bepofikoguja.22web.org/2490462644.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401505/normal_60468d70ef9a0.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/57e843df5.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/EiaifeQ/anti_aircraft_gun_battery.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupifokurox.rf.gd/davis_drug_guide_atenolol.pdfIn PDF document text
    • http://sujekafejawojav.rf.gd/project_report_on_financial_statement_analysis_of_reliance.pdfIn PDF document text
    • http://begagebo.epizy.com/better_living_through_chemistry_movie.pdfIn PDF document text
    • http://fewatebuvif.epizy.com/felarufotifajogi.pdfIn PDF document text
    • http://jigiwema.epizy.com/label_template_word_avery_5160.pdfIn PDF document text
    • http://dozafuzap.epizy.com/guvemifasisowatipoxi.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_off0000e309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE309 5432 bytes
SHA-256: dd354fb9b25e67a43159f7702751831cbf855c4b53823de3482ff39a4c795fb7
font_01_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 11016 bytes
SHA-256: d3517e838cd7d0d84d57f9f30322368c9359e577891a17984452cc88417e5d84

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