Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ccb2b8fdbed98e…

MALICIOUS

PDF

75.9 KB Created: 2021-04-07 19:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: de38e2f2a2e54700562eaed42d4cbea3 SHA-1: 60e73d376de5032d4ab32aeaad7246c5500ac8d8 SHA-256: 21ccb2b8fdbed98ef63f887a0e5427ec20e4cdedad1f6a8ea71f5c60ffad97c4
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 critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to product parts and application details, which may serve as a lure.

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
  • 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://nipisod.ru/strik?utm_term=ninja+professional+blender+bl660+replacement+parts PDF link annotation
    • http://rgtuitp.ru/how_to_unsubscribe_from_washington_examinerxy7zn.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/jH0piht/real_home_theatre_systems.pdfIn PDF document text
    • http://copyrightsupportforlnstagram.com/xasibizeborekif4d2qz.pdfIn PDF document text
    • http://cosmeteca.com/petivexevabibuzafalufqfgru.pdfIn PDF document text
    • http://taxurofetizi.22web.org/dell_latitude_e6540_i5_4200m_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofoziga/FhazhaT/final_fantasy_tactics_advance_3.pdfIn PDF document text
    • https://cdn.sqhk.co/sakiforivona/qC6hdja/buzzards_bay_brewery_food_truck.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/dje8iiq/play_online_street_racing_games.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/ihhgodB/videxurivumi.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/hdfe7ha/nomoruzevatisonikelimisi.pdfIn PDF document text
    • http://nipamaton.22web.org/a_fire_upon_the_deep_map.pdfIn PDF document text
    • http://pegojotakuxof.iblogger.org/parametric_equations_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/4ijqgeM/hill_climb_racing_challenges.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwoxigawezab.epizy.com/pabodafane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bf3e5d-8b9a-403e-96ce-2d5fa94caa20/list_examples_of_object_oriented_database_management_system.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/handwriting_sheet_with_picture_box.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/89089169126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a6bf419-8594-4e38-b3ff-8f8aec90734e/xamopeg.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/78177473759.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/mobile_automotive_mechanic_near_me.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5780 bytes
SHA-256: ab113327dd8f3c81eff6ecb2b9759cc512876d859be3641432356994332e1e1d
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 10936 bytes
SHA-256: d4f32cf6cc51a7de131645d4fb6f6f0781bb1ebde4e65099348ab3b24ac1fa4f

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