Malicious PDF — malware analysis report

Static analysis result for SHA-256 d031c87bd5d302b7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-03 14:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: e07adb3dfb062e5ae26a4502db2bcaea SHA-1: 710a3c62b4de2c3e848349342b50927de36b9fe3 SHA-256: d031c87bd5d302b786a37fcf455e729bdc2dbbf80d168f2ac8b0915173174d34
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other hosting services, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan delivery. While no scripts were directly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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
  • 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://dugedepap.ru/wix?keyword=washington+dc+visitors+guide+pdf PDF link annotation
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/6795645.pdfIn PDF document text
    • http://jushq.club/stay_in_touch_formal_email4mtuy.pdfIn PDF document text
    • https://gijamaxo.weebly.com/uploads/1/3/0/7/130740113/2617807.pdfIn PDF document text
    • https://mowibusox.weebly.com/uploads/1/3/4/5/134591082/wimizezomosi.pdfIn PDF document text
    • https://nenubijul.weebly.com/uploads/1/3/5/3/135393623/1904609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5fe27997e8ce9.pdfIn PDF document text
    • https://gopoxigubujazu.weebly.com/uploads/1/3/0/9/130969754/kekitusip_pogavuna_lafudedabevesin_nisudepitux.pdfIn PDF document text
    • http://insurancesouk.com/bibliography_entries_mla_formatn4uf7.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/dixaleko/healthy_food_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/gadogiropalor.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/52878207799.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/74944434865.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/everfi_economics_module_1_answers.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_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 5460 bytes
SHA-256: e6f596b3ac3457092aadde3838924bc0764679619e752e1e9580778e96a4c942
font_01_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 10280 bytes
SHA-256: 85faa7ad689af9e0a87e968bd71f3c512c739e92293bf190dbc7dde1bb87ff27

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