Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfa5b9d316d7e9e…

MALICIOUS

PDF

72.6 KB Created: 2021-03-24 05:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8161168419ad7b1c6f8bc6f8b99276d4 SHA-1: bafa82d219918b67798cd7102c4361e6ff1cf350 SHA-256: cbfa5b9d316d7e9e37a00f3e18385bff19202461b407628335e9791292a3cff4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=showtime+activate+not+working In PDF document text
    • https://lewedizo.weebly.com/uploads/1/3/4/6/134610291/nexosixijamisa_naxowitufave_ripodoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482207/normal_603ce61764b94.pdfIn PDF document text
    • https://vutavapurazamo.weebly.com/uploads/1/3/4/6/134643269/3030372.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469645/normal_60200e9943e73.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/nanesanuletisa.pdfIn PDF document text
    • https://nusuwexob.weebly.com/uploads/1/3/4/3/134352417/dovawidigidod.pdfIn PDF document text
    • https://gozawufi.weebly.com/uploads/1/3/1/3/131398332/7683315.pdfIn PDF document text
    • https://tewafegode.weebly.com/uploads/1/3/5/3/135350941/0eca873c8f66c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fdb133f17332.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_604b79aee41dc.pdfIn PDF document text
    • https://pobolibawawo.weebly.com/uploads/1/3/1/4/131437087/959901.pdfIn PDF document text
    • https://maverutorolo.weebly.com/uploads/1/3/5/3/135393183/90780ed1.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://s3.amazonaws.com/feliso/bhu_ba_sociology_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/video_show_pro_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/94632472023.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/final_fantasy_xvi_trailer_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/air_force_1_white_and_black_tick.pdfIn PDF document text
    • http://zogeragofas.rf.gd/aap_bronchiolitis_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/oneplus_7t_pro_amazon_quiz_answers.pdfIn PDF document text
    • http://vejabimumen.epizy.com/30360033566.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/pakistan_baitulmal_scholarship_form_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/cadweld_welded_electrical_connections.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_off0000d1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DA 5108 bytes
SHA-256: ff9aa372e5d4cee8df67f107a4fa7ed6d3d947b76345f7b0676168689a5cb1a4
font_01_sfnt_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 10552 bytes
SHA-256: 0f61d855907ee4c9a324223b7a794a44193384037246ed5d1b4c1870ea4c111f
font_02_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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