Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff92dc189b068754…

MALICIOUS

PDF

75.9 KB Created: 2020-11-23 14:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a287c12a427a45ff904e59ffe5b6d0f SHA-1: b6f6089c5310565a5d1a4fd6235827aa2fe3bc21 SHA-256: ff92dc189b068754e1cc9c637995e296193200154d45d12d9b161d7bb088f55e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites, masquerading as legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/strik?utm_term=paragraph+writing+worksheets+pdf In PDF document text
    • https://nugesipepisi.weebly.com/uploads/1/3/4/0/134042061/pafuseg_bubolidorulok_nevafit_roguzerunamo.pdfIn PDF document text
    • https://kisotupojez.weebly.com/uploads/1/3/4/4/134493444/mupapoja-fomusebosinowed-pofuzu-xasebozaxiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378381/normal_5f8b8ff2543d7.pdfIn PDF document text
    • https://mosunenipotope.weebly.com/uploads/1/3/4/7/134767451/pasakipijekopimeru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/57054e63-4f6f-44d0-bdf6-7b092135ade0/popular_wicked_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de716e0d-d20b-487b-b5cf-9b752dc4562a/sega_roms_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/behavioral_interview_questions_for_software_engineers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63452d27-c645-4957-9f7d-9760971dacdf/workkeys_practice_test_math.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/67247476090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e6e3b7-a5e5-4ab8-90ad-a3d4cec662c2/79859024136.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/ethics_for_the_information_age_eighth_edition_by_michael_quinn.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/74623471920.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/67115016946.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 5216 bytes
SHA-256: fb401ba3e4927d2c544efb5feaa9e3737d9ce2612cfdbb136ab4cb5af15e4a97
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10116 bytes
SHA-256: 9956e95d32d406010e92c7fb71c7225642f95011a00f9e4b204e2291b72dca2a
font_02_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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