Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca37061c4f99d5eb…

MALICIOUS

PDF

82.8 KB Created: 2021-02-21 06:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8dcdff5c145d8116200ffac4260b4b04 SHA-1: fc7fad48279fbd9fa461923409e39a8c9615dde6 SHA-256: ca37061c4f99d5eb94f297fc6a320faa1029ad3bb7c90501cd59bb7a11363428
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated by a tool rather than being a typical user document. The presence of numerous links on disposable hosting further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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/strik?utm_term=does+jawbone+up+app+still+work In PDF document text
    • http://unityfree.xyz/329185676457lnyb.pdfIn PDF document text
    • http://kyukty68.xyz/donolojuztsx1u.pdfIn PDF document text
    • http://bioforce-co.site/1799824518e9dyt.pdfIn PDF document text
    • http://nesobaka9.xyz/faxetitawivilanpbez.pdfIn PDF document text
    • http://lawobulobatidu.22web.org/best_electric_pressure_washer_for_cars_2020.pdfIn PDF document text
    • http://nature-ital.space/76044916603zdrzq.pdfIn PDF document text
    • http://kinoogf.space/46534653952epa3r.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/venazebizogarizakix.pdfIn PDF document text
    • http://weviwoza.22web.org/functionalism_vs_conflict_theory.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/lafelimefigetom_musoduledotu_valokivajej_jipusafop.pdfIn PDF document text
    • http://timelessdecorum.com/sam4s_sps-530r_android_cash_registerrvtbx.pdfIn PDF document text
    • http://difulomutanuv.iblogger.org/68094664240.pdfIn PDF document text
    • http://fitit.space/lean_muscle_diet4o0gk.pdfIn PDF document text
    • http://papewakoj.22web.org/swagger_editor_local.pdfIn PDF document text
    • https://rofewonopanofav.weebly.com/uploads/1/3/5/3/135312507/gakizevivowidad_wixavidomimufin.pdfIn PDF document text
    • http://topcreditmonitoring.info/remember_the_titans_video_worksheet_answersmskqh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejivexol.epizy.com/nupuviwefiwegekimi.pdfIn PDF document text
    • http://zezazemana.epizy.com/best_cryptocurrency_trading_app_android.pdfIn PDF document text
    • http://vawolanuxoreg.epizy.com/banting_diet_green_list_recipes.pdfIn PDF document text
    • http://dimebuturerab.epizy.com/employee_schedule_template_weekly.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/26435176.pdfIn PDF document text
    • http://kibulirol.rf.gd/american_truck_simulator_pro_2016_apk.pdfIn PDF document text
    • http://katakamubu.rf.gd/inspirerend_coachen_jef_clement.pdfIn PDF document text
    • http://kotidaw.epizy.com/sezibik.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_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 5184 bytes
SHA-256: 2fd5804c17934ab7cdfd482eed71ec7ff0cf859412f90fe986b6792e0104fdd1
font_01_sfnt_off00011891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11891 10800 bytes
SHA-256: 75bc18a0df9c6c0e70a6d749527b60c69b10dc3c694092cf1e5dd9065be34aa8

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