Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac09ba09699ca1e0…

MALICIOUS

PDF

78.5 KB Created: 2021-02-28 12:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1ce1f306a2997cdd998655f978ef86c1 SHA-1: 47760dee8e96e7820895fe299e2df3ba8244dccf SHA-256: ac09ba09699ca1e06f834ba67079b6fa20a0e72bef50a929c348341c60678ac7
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, directing users to numerous disposable domains, with one URL specifically containing 'strik' and a search term, suggesting a phishing or redirection attempt. The presence of embedded URLs and the 'ML_NYX_PDF_MALICIOUS' heuristic strongly suggest this PDF is designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=lexus+rx+350+review PDF link annotation
    • http://gisomog.iblogger.org/41678777041.pdfIn PDF document text
    • http://begezuwoxinum.iblogger.org/albion_online_gold_market_guide.pdfIn PDF document text
    • http://zuxenegobepejij.22web.org/blood_pressure_medication_guidelines_uk.pdfIn PDF document text
    • http://sivofopiwopuxim.iblogger.org/what_was_the_significance_of_the_reconstruction_act_of_1867.pdfIn PDF document text
    • http://lakulikelanu.iblogger.org/cancer_de_pancreas_tratamiento_nutricional.pdfIn PDF document text
    • http://xadixul.66ghz.com/itunes_for_laptop_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetobagog.rf.gd/tusuri.pdfIn PDF document text
    • http://lesexuxu.rf.gd/telemecanique_inverter_altivar_21_manual.pdfIn PDF document text
    • http://roronusosewurul.epizy.com/82209798762.pdfIn PDF document text
    • http://sojoramuf.epizy.com/85429899090.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/75626943038.pdfIn PDF document text
    • http://maladovefo.rf.gd/joana_s_alliance_leveling_guide.pdfIn PDF document text
    • http://mevalegija.rf.gd/daniel_plan_detox_reviews.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/towapudigore.pdfIn PDF document text
    • http://pilomewolax.epizy.com/esc_guidelines_coronary_artery_disease_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/fifty_shades_darker_free_download_in_hindi.pdfIn PDF document text
    • http://tewaremiluzavag.rf.gd/7971541055.pdfIn PDF document text
    • http://pegamivefeja.rf.gd/51312833446.pdfIn PDF document text
    • http://tozuduxaxikagik.rf.gd/android_games_apps_apk.pdfIn PDF document text
    • http://tulinavosubod.rf.gd/bodizodaxo.pdfIn PDF document text
    • http://mewokusexet.epizy.com/bms_building_management_system_courses.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_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 5028 bytes
SHA-256: 5a6d9a657263015acd11333bdcd729b5979a30ee857a43761d2e67e84deaede9
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 10812 bytes
SHA-256: 2fbbf924da96d8b760d132d1b40c426265ba154194dec05408294919e8f37dbb