Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f6759ada07aaac…

MALICIOUS

PDF

82.0 KB Created: 2020-12-17 00:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: da06318fc7ea3257433dd512e261cd16 SHA-1: 27c4b3f37152d342ea6318bcc39310f2418fa7bb SHA-256: 28f6759ada07aaacdc492ee8b7abbd50add9688cafa60e708cc4b06a19e3915a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/aws?utm_term=brave+browser+for+android+4.+4 PDF link annotation
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/3094305.pdfIn PDF document text
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/3741425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_5f991b6b9a5e7.pdfIn PDF document text
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/waroxiwofovobesinaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406809/normal_5fc229781ce75.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/4c2cb17da89382.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/vizegemawokaxe/93606085826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/170f7d21-bbbe-4303-b12f-58af5ae631ce/elac_spring_2020_final_exam_schedule.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc184d02cf09257bd70659c/t/5fc34e41e6d49a06bbfc85f8/1606635074258/otherworldly_patron_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/124d2c74-62e0-478a-a5fd-a966db049afe/battlefield_bad_company_2_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cda93ef-a508-44d2-a3ee-baf2810a0057/clicker_heroes_save_editor_xbox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f4edab-b8c6-470c-9a9f-7f944d78b791/la_vida_est_en_otra_parte.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/glabrezu_d_d.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 5332 bytes
SHA-256: 5e0ef0ed7c318cdf813d343d36260ded2c5bcd3833a769b049e3e9c3d12e1954
font_01_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 3792 bytes
SHA-256: 07b32360b89cbff97a706c991a6ab246c8f19a4af255043a4b398e3e69210be0
font_02_sfnt_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 11288 bytes
SHA-256: d5f93258ce7d02d22cb76132e1ba664e85fe21310c3ae15843cc630f36cc312b
font_03_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 16168 bytes
SHA-256: 0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3

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