Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63fc0891adef7f1…

MALICIOUS

PDF

71.3 KB Created: 2021-01-20 16:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c50e10f2f83931205283c4131ddb509f SHA-1: 1b8d351ec026f727aba9a25bbe427e3972b75409 SHA-256: d63fc0891adef7f1312b26a8f20315d72dccfc9b3735d8eb663c09bed34c1fa1
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors, specifically `https://traffine.ru/wb?keyword=venmo%20card%20atm%20deposit`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to financial transactions and the wkhtmltopdf application, suggesting a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/wb?keyword=venmo%20card%20atm%20deposit In PDF document text
    • https://site-1177817.mozfiles.com/files/1177817/download_piano_tiles_7.pdfIn PDF document text
    • https://site-1174981.mozfiles.com/files/1174981/walmart_neighborhood_market_springfield_mo.pdfIn PDF document text
    • https://site-1180277.mozfiles.com/files/1180277/12999152188.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/tulapurokowov.pdfIn PDF document text
    • https://site-1177159.mozfiles.com/files/1177159/whatsapp_video_call_untuk_laptop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fcf9c7245c86.pdfIn PDF document text
    • https://site-1199244.mozfiles.com/files/1199244/background_hd_flowers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_5fc2dc400d16e.pdfIn PDF document text
    • https://site-1237828.mozfiles.com/files/1237828/write_name_english_to_thai.pdfIn PDF document text
    • https://site-1176587.mozfiles.com/files/1176587/blackboard_collaborate_launcher-_win__msi.pdfIn PDF document text
    • https://site-1237828.mozfiles.com/files/1237828/zidalupij.pdfIn PDF document text
    • https://site-1176262.mozfiles.com/files/1176262/canada_revenue_agency_capital_cost_allowance_form.pdfIn PDF document text
    • https://site-1198047.mozfiles.com/files/1198047/red_vs_blue_game_grumps.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8c01b662382.pdfIn PDF document text
    • https://site-1176250.mozfiles.com/files/1176250/among_us_character_costume_white.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/pukiza/cloudera_manager_utilization_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/free_template_cv_menarik_word.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/6933494621.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_off0000dcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAD 5152 bytes
SHA-256: d85f409132c300ad23061522c4adbca9cd3c0e8267f7530a3c5e15ebe3ec1808
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 10024 bytes
SHA-256: b7e6ef1fef3809afa7b8a546d8040dd685a4809be077119a183b2bb1963daf51

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