Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0150fd04236169d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 20:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4b17e1a27a0519be8d9966ffe6edce75 SHA-1: 9f3a24c7538f841e39140bcdfc010e2614244161 SHA-256: a0150fd04236169d43304b0fff25d546d923f68d4b7035e221de8373c428b49e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The presence of numerous external URIs and a heuristic indicating a link farm on disposable hosting suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and external links point to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=hero+academia+season+5+episode+13 PDF link annotation
    • http://e-park.es/img/uploads/files/lazewutupa.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/fuxapexup.pdfIn PDF document text
    • https://clickbox.ro/images/file/16022405891.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/tinomodo.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/18996628948.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/55433731905.pdfIn PDF document text
    • https://iphastkala.com/userfiles/file/10048272699.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/sebopemusuxeri.pdfIn PDF document text
    • http://hydrem.ru/images/file/72522247676.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/pinuruvukofinijodusadaxi.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/zemananabizasuwe.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/finejeziwojununi.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/gagufakewi.pdfIn PDF document text
    • https://aksusu.com/upload/files/81888142892.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xezifotorosuzi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613488dea945f---vavowiwe.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/15615571796.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/sowomuxiwu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/3635550254.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/worojifukeluduzelunulij.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/12435313717.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/nazojimif.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://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_off0000cb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1B 15968 bytes
SHA-256: 4e3d7bbae8b7d14a7b699b5b48485405843b800eab20c6350838cc2ecc0793e3
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10880 bytes
SHA-256: f9230f4b4bf1397b3e4a47a855fd3464381e30de19d9a738a2b6705eeff6ad34
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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