Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d778f510d6bd06b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 20:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f22e58882b22155ade071cf6e55f0b84 SHA-1: ca21c0411cb3f1a474b1d8043408b15dc7f60b79 SHA-256: 5d778f510d6bd06b6040cc3b43083b5c79d7965f76d974d4c9db7e63f016b726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=can+i+get+itunes+on+my+android PDF link annotation
    • http://nktrading.qa/file/files/43562856394.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/majuxikabos.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/devabisapafizad.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/bezuxejuxilarifopale.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/vinikasa.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/30173039097.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/80645456300.pdfIn PDF document text
    • http://caythuocnam.org/images/files/25848934850.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/57442918627.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/dukurejogubowagulabaz.pdfIn PDF document text
    • http://clerus.hu/files/file/26216379609.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/fizisofavemugojipes.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/91152851837.pdfIn PDF document text
    • https://tpk-m.ru/files/file/duvokerod.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/77169548618.pdfIn PDF document text
    • https://makenie.com/upload/files/wemadejafivenujam.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/74783274301.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/83914927185.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/pelaxusagadosugugiwuwuxuj.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fiferuzunis.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/kelokamezexo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/31272598373.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210912071823.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/38910025399.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/mipimu.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_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 17376 bytes
SHA-256: 0f648f0175c1a22783776c44055343c2ab4c156df4584acf7a6b1fe02b096192
font_01_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 10792 bytes
SHA-256: 3e269475e6a2f8b29c6dfd266db2eb67ef47217a57b951e0aceab93387e5b14d
font_02_sfnt_off0001247a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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