Malicious PDF — malware analysis report

Static analysis result for SHA-256 72936da404b1b86e…

MALICIOUS

PDF

76.3 KB Created: 2021-09-24 10:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e29b6183c3b3ad8a29fc9203d93baa6c SHA-1: 0a3a9e5c34179ee98c87a4d5f2fbeb93e8a70e2b SHA-256: 72936da404b1b86e021826f47f259f30ab602a4b3cfcb545b272e6f3be86fff8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, combined with a heuristic indicating a 'download button' lure, suggests this PDF is designed to trick users into downloading further malware. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristics point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://paeonia.ch/userfiles/files/83369429264.pdf In PDF document text
    • https://adikkedua.com/contents/files/61167002599.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/47741248370.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/12641910809.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/xivegifobaragivata.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/3662115752.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/mudimofezarotawuketipa.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/worasolonaduj.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/tirojebanizisapozuwutatu.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83578525226.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/lenotoxalur.pdfIn PDF document text
    • https://absoger.bmv-communication.fr/uploads/files/kovoxuvububofoxaduje.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/ligobegu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/vokeb.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/67552809158.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/repapasozogut.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/rixunifufofajafuzax.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/runutupok.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/48783916747.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210907_A29723CAF13A5975.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/lofubuwoluta.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61730767586.pdfIn PDF document text
    • http://agrion.org/upload/fichier/32832482606.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/dilebomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=frozen+keyboard+apkPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e8fdecb5d3936b1e2ebf478c8061c8b3/28900605290.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_off0000c552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC552 10364 bytes
SHA-256: 2604af6aa2c4f40ada08bded0fdcf7ce86ca37f8fda713d8310a8652e4d000f5
font_01_sfnt_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 17972 bytes
SHA-256: 216f7fdbbe4ebefdcefc2f7152d46ae7a85430d8d1cecad255979ced8bcdeed2
font_02_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1