Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0d65065b93c8f6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 11:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 007376de96fb3ce0badbea0019872b60 SHA-1: fdcec73257232f22801a8528e670ec48f4a97d53 SHA-256: ff0d65065b93c8f680fc9f5caa1bd976c02d117a632570d2a082a09e0ae12d32
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 link farms or disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to manipulate search engine results or distribute content through a network of linked sites. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://le383.com/uploads/files/66108600488.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6419740cb4556e748f70f776ea9a2964/gajidejupiposiba.pdfIn PDF document text
    • http://vkts.se/userfiles/file/xasisevuji.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210914185611924.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/jebixuwilemibivujavika.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/ponojoxorufoxabevesopajo.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/bawonoforinisabobaxifo.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/71004392186.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/55158968617.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/56508160024.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210917201759.pdfIn PDF document text
    • http://koddous.com/userfiles/file/patodivosegulib.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20082060851.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/paxugexajam.pdfIn PDF document text
    • https://bauarch.bg/files/jigomifoxulujuti.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/vitokob.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/saxetu.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/zunokodekilipitamagumuz.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/jarulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=songs+download+app+for+iphonePDF 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_off0000ab18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32A 16812 bytes
SHA-256: c9bc037144d6cc8b2db14ba8a5a34feb0b3f33ffabc52dc4f9ef6709c5cb7067
font_02_sfnt_off0000ee9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 10840 bytes
SHA-256: f83d8b51a97734ce98971d5552e2cca01a20c91f426f7dfbf48e7b4f5263fd48

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