Malicious PDF — malware analysis report

Static analysis result for SHA-256 7792b43196435f0e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 21:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ceac8cf2889be4f4d77ec7e5840e28a2 SHA-1: 3bc0bb9a2a40ba07b8cca78fdac461c7708a10d2 SHA-256: 7792b43196435f0e00b76ce26d2e0c8fc91b09dd73c3e2ab1af8132985c5ec0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that redirect to external sites, many of which are part of a link farm hosted on disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=farming+simulator+2020+android+download+apk PDF link annotation
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45296274898.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jigusoximovolijotikofigox.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///11309993921.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/9154876454.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120912065688.pdfIn PDF document text
    • http://tid.vn/upload/files/kizutulelavezolanuboli.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12099270859.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/sifatirifixesegowivoro.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/33429181611.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/59499195640.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/45872454607.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161303308e5362---59638241261.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/74334227413.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/84253355172.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/nigodefomotusovujedinit.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/34151996235.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/1532628397.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210907181139.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/98916492048.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/fidokuziw.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/rewabedokenoganajeriwufi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1025023e1---nuduzuvirivasonipe.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/54992057985.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_off0000bc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 15720 bytes
SHA-256: c909a4e1188c62307a7f6a85ad1ae8ae732a87b2c57cbe4b52853ed8687c29a7
font_02_sfnt_off0000fc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC86 11100 bytes
SHA-256: 3b5fdf9fbfaf3b2d132fd624969b9fb4151c3bf6224e23ceb38cd524c69530a2

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