Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d76de3862a3b190…

MALICIOUS

PDF

87.1 KB Created: 2021-03-20 20:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5792471d4d03f33650944dc2a0f37c3f SHA-1: e10106e2d7cae3691d0425c9c1b49c51dc0063ee SHA-256: 3d76de3862a3b1900893c667fbf3d2fa631ca6f8fb2c4c23c25a6dc94fc67953
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI that redirects to a suspicious domain, likely for phishing purposes. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious site, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/award?keyword=california+zephyr+map+pdf
    • https://cdn-cms.f-static.net/uploads/4473963/normal_6022eca592944.pdf
    • https://cdn.sqhk.co/xibetevoxaj/bgd9Hy4/oscar_fish_price.pdf
    • http://fovikoxesaweziz.medianewsonline.com/butamusujug.pdf
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5ff36ccf661f0.pdf
    • https://static.s123-cdn-static.com/uploads/4453885/normal_6002fe0b01613.pdf
    • https://cdn.sqhk.co/balekunu/H0ieaje/contact_amazon_prime_now_customer_service.pdf
    • http://gamukanemafutu.mywebcommunity.org/zapelikozeziludurupo.pdf
    • http://falorilipeb.mywebcommunity.org/que_tipos_de_titulos_de_credito_existen.pdf
    • http://ridaxaki.mywebcommunity.org/35135140137.pdf
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fed081c16430.pdf
    • https://static.s123-cdn-static.com/uploads/4464710/normal_5fed330c59ab1.pdf
    • https://cdn-cms.f-static.net/uploads/4418993/normal_600ad601eb532.pdf
    • http://panuxidoku.22web.org/vekajuwovabogutexamudoze.pdf
    • https://cdn-cms.f-static.net/uploads/4479213/normal_5fe65e8c14e9f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jinibodakix.epizy.com/kawuvokij.pdf
    • http://bosirizowu.rf.gd/fifty_shades_freed_movie_actress.pdf
    • https://s3.amazonaws.com/zuponefi/free_linux_live_usb_creator_2._5.pdf
    • https://s3.amazonaws.com/napisakaluja/67661187908.pdf
    • http://punegejofuj.epizy.com/seamless_transitions_pack_free.pdf
    • http://nazifaba.rf.gd/96076264963.pdf
    • http://taberadajip.atwebpages.com/beckhoff_training.pdf
    • https://s3.amazonaws.com/divikufifir/national_geographic_wild_videos.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011665.bin
56602920fb0b1c75f661cb8e370a255e8a42c3e641a7c47f6713433fde839348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11665 5160 bytes
font_01_sfnt_off000127d8.bin
5904f18c3917660b21c04b8bb5b84dc3a08b4ea27cf980dfbf2ddb3e9d3e5ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127D8 11612 bytes

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