Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ea1a90ba81aa5f…

MALICIOUS

PDF

59.4 KB Created: 2020-11-16 20:26:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dd0d3ccf4cab4945588234709d0c2856 SHA-1: d5ee88decbf37160cb091e0917b271960ff83b92 SHA-256: b1ea1a90ba81aa5fc1eebd5515ca636b3a6d213537cc4d1a5408a379e3203181
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=minecraft+pe+14.+0+cepde PDF link annotation
    • https://tevosomevovek.weebly.com/uploads/1/3/4/6/134697335/mamibok_bisodelefuweju.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/pemaxivo.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/5823824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_5f9567da4897d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421966/normal_5fadf2089fb4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_5fa6a698122fc.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/6583597.pdfIn PDF document text
    • https://tuderosuf.weebly.com/uploads/1/3/4/6/134652240/1203582.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/e35a6565-81ed-4ac4-b0a1-aec81db3a870/nadijaditewonekafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f797c440-6c3d-4e7f-8325-f1ba36aca0d9/5669027427.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/dungeons_and_dragons_monster_manual_3.5.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/91950248235.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb603ce-0849-4cc4-99d3-47d2d99e3890/deviantart_custom_box_code.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_off0000ad73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD73 5260 bytes
SHA-256: 642720e6a43b6c59bd23a8cd7e5fd96d48dbfa5cfb1c36411861d9cc4744766e
font_01_sfnt_off0000bf82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF82 9820 bytes
SHA-256: dae9875536bbf8daadc4be3c865c7ea093a84c2c5c8c89bca92da978884692a1

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