Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb77c6d70e47a32…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 18:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6beb3071f289252abb51ad22bc630ed9 SHA-1: 1a56dc76193568412c0cf7bdbba1e75e79da41d7 SHA-256: aeb77c6d70e47a3291fd7b1c69898cce1234460753e0ee628cae3304b54d647b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://yafferge.ru/strik'. This URL is likely used to lure users to a malicious site. The ML classifier also flagged the PDF with a high probability of being malicious. No scripts were extracted, but the presence of a malicious URL strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=how+to+draw+easy+anime+body+for+beginners
    • http://gaxesujite.medianewsonline.com/innovative_business_ideas_in_pakistan.pdf
    • http://tofoxewesaxizuz.mywebcommunity.org/moto_g6_plus_pattern_unlock.pdf
    • http://numusuri.22web.org/ellen_degeneres_queen_sheet_set.pdf
    • http://pinopizo.sportsontheweb.net/1499159891.pdf
    • http://buputenajonix.mywebcommunity.org/xoboxovuxenejab.pdf
    • http://ruvenebigolusep.mywebcommunity.org/76397578484.pdf
    • http://gililofus.medianewsonline.com/mipixufudagofopuju.pdf
    • http://kolekewoni.mywebcommunity.org/alexandria_v_121.pdf
    • http://meroxisawifagu.mygamesonline.org/simple_interest_worksheet_kuta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25be7aeb-18e9-4c6a-9fe6-f665171fffef/46563676463.pdf
    • http://dogiwexor.myartsonline.com/set_up_instructions_for_nest_thermostat.pdf
    • https://uploads.strikinglycdn.com/files/32d39533-d777-40c7-826b-b23f3528b3bf/basics_of_grounded_theory_analysis.pdf
    • http://lofoxos.epizy.com/sizuvojax.pdf
    • http://texazufuvo.rf.gd/lagu_maher_zain_vocals_only.pdf
    • http://dumizalu.epizy.com/24148436999.pdf
    • https://s3.amazonaws.com/zexozavo/5_minute_guided_breathing_meditation.pdf
    • https://uploads.strikinglycdn.com/files/2f24e8f6-ac83-480e-a650-5a5240bbd0cb/harley_davidson_machine_shop_near_me.pdf
    • https://uploads.strikinglycdn.com/files/7acee35f-0f03-44f5-b9f6-793393d2616f/lumuwidufumebezopizaw.pdf
    • http://tefotesibeto.epizy.com/lol_riven_guide_s8.pdf
    • https://s3.amazonaws.com/vufuzewasi/submit_form_data_using_ajax_javascript.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010304.bin
22bc5db733c01d1a78b7d7ea0595c8a77119cbd4671e91fc9bbe7842f4474f5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 5492 bytes
font_01_sfnt_off000115ad.bin
416e802c23c34b7e2b44fab3915312548e14e9ca0c5b491fbbabff75609194ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 10900 bytes

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