Malicious PDF — malware analysis report

Static analysis result for SHA-256 84766acd3bbff52b…

MALICIOUS

PDF

86.0 KB Created: 2021-04-08 01:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d01a064a18cbc1c6aacacff08604f48f SHA-1: 109a0deb03fbdef1df9095d8520c83b7cfa1d3dd SHA-256: 84766acd3bbff52b92c61ad5b0541f3897799b921299d1fed4dbe18571d7ea7f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://mezovuduw.ru/strik?utm_term=best+fly+tying+kit+2019 PDF link annotation
    • https://domaruvujus.weebly.com/uploads/1/3/2/6/132683142/jigerojuwefidedenob.pdfIn PDF document text
    • http://lastasked.com/vopowedafamuxovamuk0cubc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412377/normal_6025eabe71e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409244/normal_5fe6cd2b1bf17.pdfIn PDF document text
    • https://rojanekawuveruj.weebly.com/uploads/1/3/1/3/131380666/tawori_rikajezuber_jexapurolowa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fca7d9eecf6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_6016ec1f6b3a9.pdfIn PDF document text
    • https://bosonelete.weebly.com/uploads/1/3/0/8/130873804/5b9ff3a38d195b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_603695de99187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_600dabe96e77d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_6067854117a7b.pdfIn PDF document text
    • http://goldstein.berlin/lusuzinab4rvi2.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/bf0b1540-9343-46b7-a2ee-7df1fc4d6b5d/batman_beyond_comics_read_online.pdfIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_f38e019e495b4a81a4e909384c1a1ff9.pdf?index=trueIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_e3e95f1f8479457c8569305ae256ce7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b275a8a-33e8-4e01-88c5-fc732a0ffd76/el_poder_de_la_oracion_en_la_biblia_catolica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff91c96c-5efb-4f9b-a407-a8017a43ada0/rojilido.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_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 5328 bytes
SHA-256: adcd6fe38825c3012c0b759a4f5280711000d8b9c4d6625df921cd4a8b7ca762
font_01_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 11348 bytes
SHA-256: 0af2439e691f38f02205ae95103b85b456b1f96fc7ce619a2e8eddfaa955ed1f

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