Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c1a3dc2b393378…

MALICIOUS

PDF

90.2 KB Created: 2021-05-10 03:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3ef06005a238fb58f6cec8e1ba1aad43 SHA-1: 558f1642ddfa5c2dfe67035cf714ac950a548b81 SHA-256: d4c1a3dc2b393378da8e3ee3dd7cab26df7a8968392cfb4505566e58a22fdadd
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 0.9998

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=fifty+shades+of+grey+cast+hate+each+other PDF link annotation
    • http://moxipafuxoxo.mygamesonline.org/formulaire_certificat_de_cession_de_vhicule.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/approaches_to_financial_management.pdfIn PDF document text
    • http://wafesegagi.iblogger.org/jirum.pdfIn PDF document text
    • https://cdn.sqhk.co/nenafodud/qgBgff5/kroger_gas_station_prices_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/jbaUhj6/bopisipijunorigupedavuku.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/Rnggwja/sliced_bread_recipe_ideas.pdfIn PDF document text
    • http://sakivometo.medianewsonline.com/82773600749.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/siwifufekuwapos.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/63638188960.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/hhaP0gj/sutinogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/electrical_design_for_building_construction.pdfIn PDF document text
    • http://nixutiwo.rf.gd/anonytun_untuk_android_2._3._6.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_048024e5720f4524ae69281fa94269d2.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_dee489bdcb35492e8c79279b271654d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3cc365-309d-4a3c-b088-4d5814b8ac01/dell_7010_driver_cab_windows_10.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_b07b1d27f7e74007a7d00df5c23cc866.pdf?index=trueIn PDF document text
    • http://rakojumetaxo.epizy.com/46214998605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b2b0f8-c7e4-4614-8e25-e616bbd48a35/zuxuda.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_off00011e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E02 5308 bytes
SHA-256: 8d4077548c7a98a3cde25bc08abea6aaa5e402845f230f516a54a3b553722f96
font_01_sfnt_off00013020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13020 12808 bytes
SHA-256: 1f1d61ad32d8693ab15d3ade38b392689e5bbaf51ae40d3e348b35acd07613cc

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