Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbee9fbcf54e2802…

MALICIOUS

PDF

65.6 KB Created: 2020-11-11 20:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0b06f768ddf2d8ecd049cdca832b7b46 SHA-1: 6434f83a4adda16b3bc544c5eabc1c6027d551a6 SHA-256: cbee9fbcf54e280203889d098379ac1b332d7fb1eaee2f7807ada30d3f2af9dc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffine.ru/strik?utm_term=ecuaciones+exponenciales+resueltas PDF link annotation
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/b4b3eb38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f8ea0499b761.pdfIn PDF document text
    • https://jawanowek.weebly.com/uploads/1/3/4/3/134356941/zedego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_5f9564d97781d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5fa3b62375b27.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/698c508837b21.pdfIn PDF document text
    • https://datirelegewewat.weebly.com/uploads/1/3/4/3/134329883/8768291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5fa9e821cb826.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/roxawo/vba_excel_functions_list.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/ar_test_questions_and_answers_for_the_hunger_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1445f517-cd31-483e-9e91-99fe4ea77378/dosibamowunape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a6fec1-be64-4741-80d2-784983442485/mavuvatexemerekajogavopag.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/new_antifungal_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/letexejive.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 4952 bytes
SHA-256: a20309b1895bec4ab052462cdf6aad4d0cadf66e92aff93a1ff10d3e8849b99b
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 10788 bytes
SHA-256: dcadc9736edb8f8a6c2fdf4fb9e36eca1e1e69dba444c0303c8f7399d6ad8f23

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