Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb1a28237dd53d3…

MALICIOUS

PDF

82.7 KB Created: 2021-09-14 14:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd9805f8ea14fc3ee5932deea1012783 SHA-1: 93280817ae0138f5beb2d3a642f4b77be0b252df SHA-256: 2bb1a28237dd53d37a3769c8b9cef0a512e59bd2da4ea02ad8dd06272974ef18
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.rougeindigo.com/ckfinder/userfiles/files/mevanipese.pdf In PDF document text
    • http://wannawwannie.pl/userfiles/file/mojudaf.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/gigabulagirobimuwap.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/29748788427.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/22836220968.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/51917427366.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/benilowixogiga.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/vewujufaguroliwobalurun.pdfIn PDF document text
    • https://ckmandarin.com/uploads/91368168359.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/29642878266.pdfIn PDF document text
    • http://surausa.com/uploads/files/jenarokukaw.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/10094880304.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/50505509873.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/70598738111.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nemedivivinof.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/gigopatejitagi.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/26599540308.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/robododusugubet.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613450423fe69---janogerakozemadidob.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161402fa5f2057---jiwikuzowez.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/59045068771.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/40325077110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=robert+kiyosaki+the+real+book+of+real+estate+pdfPDF 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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 18268 bytes
SHA-256: 4976ad96db4d3fd8e1933e0d3f2e20bdbbdfdb79c87f4907d6b2bfb652e4604d
font_01_sfnt_off00010bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 10884 bytes
SHA-256: c105b721dea86d55fe0bf046fcc85d7c96acbaabf5ff3135b88a3d867c0cca94

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