Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de42682b65c45a6…

MALICIOUS

PDF

78.3 KB Created: 2021-09-17 11:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94f523088240b1ce515b20769f918bd3 SHA-1: 35254838f420d9f7162d7e5f5002e55a632b66df SHA-256: 5de42682b65c45a6236999cad0a25bb1a99d9acaba5079de6674f5deb6347acd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, and the ML classifier and ClamAV detection strongly suggest malicious intent. The presence of URLs like 'http://upnbkk.com/file_media/file_image/file/bobewipopujunozipatisatux.pdf' suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://upnbkk.com/file_media/file_image/file/bobewipopujunozipatisatux.pdf In PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091418220573499.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/73673904913.pdfIn PDF document text
    • https://fq.ua/images/file/lozemapasiwisixanamo.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78052875068.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/60463805319.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/xanapalofoperudovavatojaj.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/jututumozedo.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/nunazuvi.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wunemegajomap.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210910_184914.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/kivujuwi.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/duvojudubodofufujevubuf.pdfIn PDF document text
    • http://runhouchem.com/upload/files/61823002609.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/fuwonetejewirixewa.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/suludulowa.pdfIn PDF document text
    • http://wohntraumgmbh.at/gabutanalo.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/83371299969.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b7af4fda3fba5fcbf95f8de8c866b0c2/dujapozifuzeguxemexawu.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/zobeze.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/kisitigenev.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/pemebokuvudoxuda.pdfIn PDF document text
    • http://cy2hand.com/userfiles/73034196239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=honor+call+recorder+apkPDF link annotation
    • 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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 10232 bytes
SHA-256: a49d0a1adb0a2f9f0c30fb2497db34643111f43a7b36cb8316a99fad40b59d3a
font_02_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 16612 bytes
SHA-256: 2120b48b3991cd0810d82a826c28e58705b7046e0513308f67d0bde8e6cfb0b9

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