Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d86a10a20ce888b…

MALICIOUS

PDF

83.1 KB Created: 2021-03-16 08:22:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5e22a7dcee4c807a0efd3cdf48ffdd6c SHA-1: b1c8771d9d066a7be1d0ee81c2fe18a08bcab35a SHA-256: 5d86a10a20ce888b253555e0577d5988ca20dbc567dd4b9624e8080da0ac5d20
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to search terms, further supporting the phishing pretext.

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://seumenha.ru/award?keyword=i+dreamed+a+dream+piano+music+pdf PDF link annotation
    • http://freud.icu/sagujipapilutawoburirub72xqo.pdfIn PDF document text
    • http://ca-manalapan.space/vowomokeneduzdnskb.pdfIn PDF document text
    • http://honbiz.pro/honeywell_pro_6000_service_manualljtmn.pdfIn PDF document text
    • http://penageli.getenjoyment.net/27406478379.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/forex_trading_using_volume_price_analysis_anna_coulling.pdfIn PDF document text
    • http://cancandance.org/20399395243bvmjd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420476/normal_5fcea53cb4ebd.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/19099619074.pdfIn PDF document text
    • http://ulekschool.online/last_resort_pokemon_gozmhyi.pdfIn PDF document text
    • http://interior.estate/48935053592ckc27.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/2cfb7748-d6cd-41bf-8d1c-e9aa4cd1c8a3/michael_vey_the_prisoner_of_cell_25_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1f2df6-d01a-4470-9364-3b6907cf8ca7/vunedogepezeviluvokati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378f9e36-4b82-433f-80d3-3434748d33a6/kurasabudezulonasadul.pdfIn PDF document text
    • http://jewofeket.onlinewebshop.net/dewipu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 5208 bytes
SHA-256: 85b5c08f343c395349b5ea90ea7145efc25ddb03b07e459e20e2f0902b9533c6
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 11608 bytes
SHA-256: 20234f7c7c740c9fbeb61913fa573477177395e673e023f84cc7345609310e20
font_02_sfnt_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 16100 bytes
SHA-256: 9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249

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