Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f345a85ec8650b…

MALICIOUS

PDF

79.6 KB Created: 2021-05-07 01:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d8a754c51263c91c21273228f139b70b SHA-1: 912c2ac5e45f23407624ddf79fac75b386393ea2 SHA-256: 33f345a85ec8650bd58f23f9163342dbc28510a03a78bea599ebc40b01bceb04
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 0.9961

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://bologen.ru/strik?utm_term=how+to+use+ergobaby+360+mesh PDF link annotation
    • http://anyita.space/aliexpress_apk_old_versionzhi6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_600a120c53277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482617/normal_5feec514c2541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_6068f8d3d230e.pdfIn PDF document text
    • http://kzrovk.xyz/undp_asset_management_guidelinesjsdvl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_6021a5a37f094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_604af1efb056e.pdfIn PDF document text
    • http://world-wild-shop.com/71294134047xjlq9.pdfIn PDF document text
    • http://llloooodddd.space/ralinolufakevabijapqujlv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408485/normal_5fccd6630422f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452599/normal_5ff1b3bd7777b.pdfIn PDF document text
    • http://passive-income.ru/dragon_book_series_for_adultsjik56.pdfIn PDF document text
    • http://online-bestshop.xyz/sony_vegas_pro_15_free_download_32_bit5uycj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412897/normal_6066b53c425d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6015efc1c10c0.pdfIn PDF document text
    • http://zahlungsservice-ch.site/40423769114jh7et.pdfIn PDF document text
    • http://nebo-baikala.ru/ancient_greece_geography16mhu.pdfIn PDF document text
    • http://vienvozvrat.site/similar_polygons_worksheet_houghton_mifflin9qtb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419820/normal_6063f170789f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f8f6cedf1.pdfIn PDF document text
    • http://mybiol.site/denalupatesamusito1icob.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/66bc14bd-2e7b-4529-9bc8-7398e372dbee/34638565138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be9736d-cc2a-453d-9d50-248159339d18/what_does_monstrosity_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a78ea969-bb45-4930-a194-6f678b365aab/xowezajamepekajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeeb0498-4d81-478d-a73d-e13c78f04646/81261439625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f6cbd8-1406-4294-8f0d-ab72b25acaf3/3775372118.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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 5824 bytes
SHA-256: f649ed90abd308f1c2104f264cd68b1cdd1a11f04e1662a4a730b47d0dd5fd48
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 11028 bytes
SHA-256: 628a5c044d0fc91cb5e4fc6667ca77f593dc5cbd8b896ebf67833d781892c097

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