Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec8cfe9e422df1a…

MALICIOUS

PDF

73.5 KB Created: 2021-05-05 16:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c78327b6f4497f5e5a204a5ff20570b9 SHA-1: ecbdc94cf58f38ca9d32d9bf99e986903e0b5a06 SHA-256: 8ec8cfe9e422df1a4b3f8c5b82f24229f3bdf1cf502e6a112429d9e4b9fd6ef3
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a site offering driver downloads, masquerading as a legitimate resource. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. No scripts were extracted, but the presence of external URIs suggests an attempt to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=lenovo+t430+wifi+drivers+for+windows+7+64+bit PDF link annotation
    • http://gigusopubevese.22web.org/classroom_language_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/cF5rr8f/berixovipofulifen.pdfIn PDF document text
    • http://zarujosusaxom.22web.org/pedawiv.pdfIn PDF document text
    • http://sizegivip.22web.org/a_monster_calls_book.pdfIn PDF document text
    • http://misirabul.22web.org/generating_equivalent_expressions_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/hakcDjc/10488309611.pdfIn PDF document text
    • http://zufonirawanowo.iblogger.org/barriers_to_communication_in_schools.pdfIn PDF document text
    • http://xejobaxonewaf.iblogger.org/where_are_nucleotides_found_in_dna.pdfIn PDF document text
    • http://megarafulosibef.22web.org/pokemon_3ds_roms_free_for_android.pdfIn PDF document text
    • http://pemirok.22web.org/1871834568.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefabe/vufamumeda.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/bugujajokofizepizitufu.pdfIn PDF document text
    • http://lesolasate.epizy.com/xudezibiwetafipep.pdfIn PDF document text
    • http://galexuduxegi.epizy.com/automotive_air_conditioning_and_climate_control_systems_download.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/korean_from_zero_2_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/13479392155.pdfIn PDF document text
    • http://sarirepenibe.epizy.com/lonely_planet_bhutan_travel_guide_download.pdfIn PDF document text
    • http://xifenarubomes.rf.gd/anatomy_of_abdominal_muscles.pdfIn PDF document text
    • http://jalasofumikom.rf.gd/pirates_of_caribbean_ost.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_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 5520 bytes
SHA-256: df1969cd50e46ed3b3639c415a04f44a2458ac0fa38af0d143e020a539fb4e5e
font_01_sfnt_off0000f337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF337 11240 bytes
SHA-256: 82174a06ce389c305f783e1991d809028216e5a8ba88903e7242df596effe084

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