Malicious PDF — malware analysis report

Static analysis result for SHA-256 7859e24089b3e9e6…

MALICIOUS

PDF

73.4 KB Created: 2020-12-07 06:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1e4aced331a67786ddc5cee92c61a476 SHA-1: df3441bcc99cce8824258ff5cca4c973fcab51a4 SHA-256: 7859e24089b3e9e6e5bf2d990ac71205ed6f10e3a29a61fa286e0171c8ed5202
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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/strik?utm_term=top+ten+most+dangerous+gun+in+the+world PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f87028656adf.pdfIn PDF document text
    • https://bizonununifewe.weebly.com/uploads/1/3/4/7/134773553/xidejarox.pdfIn PDF document text
    • https://ruxevikupasej.weebly.com/uploads/1/3/4/6/134663562/2656245.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/dorasidiwad-dukud-kawametuzeji-zifusororedate.pdfIn PDF document text
    • https://wuwifure.weebly.com/uploads/1/3/4/6/134647121/gegubopobokexajuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466659/normal_5fb2be4e40a30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368740/normal_5fbeb8d5b62bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f959f1d0c022.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/bisazabe/microsoft_access_for_mac_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ba7e0a2757459b03f866/t/5fcceb330ab5d62febf2daab/1607265075666/jiochat_hd_video_call.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b109405d5340f34a7138/t/5fc8b142b74dd54858dedc0d/1606988100677/file_manager_apk_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7f6564-4819-4947-b6f2-3dfd9ec227c9/mivela.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/gumelu.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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5416 bytes
SHA-256: 8cbdbbe79b74a0014b1e938dd1db6d60ed37e124420fd63cd5d912a7b722041f
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 10800 bytes
SHA-256: 71e5add22055313a556c0d54716f7fa74f76b7c99f9ddbbb6c1a1772112f5595

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