Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d2ec3b826f6101…

MALICIOUS

PDF

77.5 KB Created: 2021-05-25 19:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9c6f1b27c5dae3e210b0206afd71087a SHA-1: d8e383101416a98bb42328fae2dde7a7034b0a4f SHA-256: 81d2ec3b826f6101ca8c4ca94238a843268b13f1d0d28fbf1a0f7541fa9976d3
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 0.9998

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://druttle.ru/strik?utm_term=bahubali+2+full+movie+download+in+hindi+300mb PDF link annotation
    • https://lipanoragufa.weebly.com/uploads/1/3/4/4/134489679/7264612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_6061a8eb62902.pdfIn PDF document text
    • https://pupiwikupexi.weebly.com/uploads/1/3/4/3/134348736/duxovozofuruguxogu.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/447530bf68bf6.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/savam-dafuze-guwusiwi.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/mijumevawapupiferegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9ab505e67f.pdfIn PDF document text
    • https://fisupipegapug.weebly.com/uploads/1/3/4/5/134515512/nenaja-doxigazis-burunameb-fizamidamu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428334/normal_5ff4b4cbba240.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/8854c5d5f18c1d.pdfIn PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/2033607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fff78deac172.pdfIn PDF document text
    • https://jerepukiw.weebly.com/uploads/1/3/2/6/132681878/3981731.pdfIn PDF document text
    • https://jexurelo.weebly.com/uploads/1/3/4/8/134853401/xajabigokevere.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/64bd754f-b1a2-48fe-907c-37c62158bbbb/zobodajeziviwesutujelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14e6f25-23ae-4b1a-a9ab-e8fac3c2a3be/wibelapujinu.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_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 5652 bytes
SHA-256: 38e1832c4e407ea7fa56641602df04549ea07c834b0c2c079babfb6ae2fe8cf1
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 10628 bytes
SHA-256: aa2f0f47a3507c2c12cf2bcc5154db0c3b41b4550c68bef52ba0f059c03979a3

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