Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8b25c5520acf03…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 12:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5228dc5b71caf2e74335c976136d2866 SHA-1: 2f8224f263fbbf436ff5196be84b5a5e8df785fb SHA-256: db8b25c5520acf03fd9ec90d6c678178663d9a43fcfb7a3d6cd7e54d2286ff9f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to external URLs, one of which is an IP address. The presence of a 'download button' heuristic further suggests a social engineering tactic to trick users into downloading a payload. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://chcial.ru/uplcv?utm_term=120x+game+booster+pro PDF link annotation
    • http://studiolegalebisantis.it/userfiles/files/82283532721.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/77267256347.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/19892507018.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/93918182800.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/lilitefepanefa.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/somifig.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/39836800965.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161351424cfcab---tazuwuves.pdfPDF link annotation
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6oqjqm3023bvoiv12kcksdiotu/donijasavubetorujur.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/13633721845.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/65748719903.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210901_ddfc0.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dajolorugonejer.pdfIn PDF document text
    • http://teraval.cz/res/file/kakexuboloxuk.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/39799132165.pdfIn PDF document text
    • http://wdnederland.nl/file/62048954677.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejamugatigul.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/dubamuxopa.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/mabuxomewadamif.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/kezogizitumuzizaxaw.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/zixuxukon.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344ec29e970---fikujifejato.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE34 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 10792 bytes
SHA-256: 23496a303bdf8c4aac23e36a0ccb2bafe94fc2e8a8006782b277518720fa244c
font_03_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 17048 bytes
SHA-256: 7faae5add806b4e5e3c55249b369243cbaeddf46ae45c06b70fe8778380e3c14

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