Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca59a5ef8cfd5a5…

MALICIOUS

PDF

77.7 KB Created: 2021-03-09 14:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 75f30b1da022344c4978ea46fca10489 SHA-1: b9dbd6b515509d66e5b1f3b4d8da3d2bcf967ef0 SHA-256: 6ca59a5ef8cfd5a5dcc75401e7902be77ce5f3b5632b435e7a75b6d2dc83da43
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is vilenefex.ru, which is likely used to distribute further payloads or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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
  • 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.
  • 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://vilenefex.ru/award?keyword=almidones+modificados+pdf PDF link annotation
    • http://trokot-shopnew.online/20955308528yozjd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_603e58b14f0d9.pdfIn PDF document text
    • http://silkhfig.bid/omron_vs_mini_j7_trke_kullanma_klk6ao7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_600074ad6a972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_600ff14a7b762.pdfIn PDF document text
    • https://wobipogipexiwom.weebly.com/uploads/1/3/1/0/131070125/a1640146d.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/godufuxiga_ravad_pepakuxodaxa_popinazesuwif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fcee94b7314f.pdfIn PDF document text
    • http://shoplus.info/40791734991hrsq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374009/normal_5fe2b31617dd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/90786531-9dd8-47d3-bd76-78e6a32680d7/62180431006.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/wufakiwexuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/blizzard_really_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/73692428929.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/careless_whisper_alto_saxophone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/wabapi.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/cavendish_university_online_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/dirutasodamafunala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/268310f6-17e9-4d43-b29c-d53b60da37a4/free_printable_daily_weight_loss_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0cec56-07a5-4648-978d-3de32b556c49/section_4_of_the_negotiable_instruments_act_deals_with_mcq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc03391-2fd2-4587-b205-681e86d15e76/1264526907.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/zariwanasegobafapazepo.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_off0000ef3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3A 5196 bytes
SHA-256: b3f377653e01baa06be21e8020d8ffe1c8bb2dc77683a5faeb68347d1cb93574
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 12032 bytes
SHA-256: 4d5a78fbda433927473cffc1565cf2cf1c911e16e8b0e21d522e3c905b48e492

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