Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bd0e1120cb41a96…

MALICIOUS

PDF

67.6 KB Created: 2020-12-17 00:29:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59dd1a2e54ad3697520706f837403c85 SHA-1: 7f7f517e4b11a4b947d0ed1461416ccf8e2f9965 SHA-256: 5bd0e1120cb41a9663be93672ecc62c098e48b593e2b99372bea203e6427bcfb
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and point to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://traffking.ru/123?utm_term=big+data+course+material+pdf In PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/dujesejokibisam.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/wesisekulukifenade.pdfIn PDF document text
    • https://siwovipon.weebly.com/uploads/1/3/4/7/134705210/2267097.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/0e7406cc99735d4.pdfIn PDF document text
    • https://bevokelas.weebly.com/uploads/1/3/4/3/134310014/vifebabaxekibaditik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fbffe36319d2.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/judinozipu-podijezes-nizatazadigesud.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/53645d5a-ca47-4bea-8919-923620b3a010/daybetter_led_strip_lights_lowes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614cacf7-4029-4dcb-b73b-d0644aa793f8/331873253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccbe655f-8d21-46d9-85e4-e5b3b7d2742d/59180216073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be594e10-535a-4518-9bcb-927b75e3b3f2/maths_tout_terrain_cp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95424d6-1b0a-49f4-b3fd-f64164a78b94/62640277651.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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 5524 bytes
SHA-256: 97586cc26082ce5d6815c990a7635c7ea58cb75303de1f30300a573fed478a8e
font_01_sfnt_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 11076 bytes
SHA-256: db3e4456c76c6aa8cd7dde4dd3d30c80b97b218ec3e9ffa7861befb21856fa04

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