Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff05889f573d865…

MALICIOUS

PDF

75.5 KB Created: 2021-09-16 02:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc701f82fc160a2570ed1abf318630c9 SHA-1: 46aeeb3848700673c4e02b38e3c7e150d0a5cef7 SHA-256: dff05889f573d865f9eec30b48b0128c6c6a72d9759bd6823cc2a6f1a5fa0265
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary attack pattern involves leveraging these links to deliver a payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=plant+cellular+structure PDF link annotation
    • http://koppeika.ru/userfiles/file/jusebilixata.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/93161873968.pdfIn PDF document text
    • http://ux-school.ru/files/files/8984055267.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/99469163107.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/balemolowajem.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/15061099031.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/84535789678.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901102508369629.pdfIn PDF document text
    • http://melabo.com/upload/files/kikesivovobanew.pdfIn PDF document text
    • http://mayjack.com/upload/files/mumizevu.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/basajalipapunabevi.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/basufirinilufegoxubeni.pdfIn PDF document text
    • http://fluorescent-training.com/file/21844708910.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/93423433357.pdfIn PDF document text
    • http://santehnika34.ru/images/file/guvawopuxoxuz.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/pajusonutufojobe.pdfIn PDF document text
    • http://nenorm.com/files/files/welaneretimupulaj.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613031428cd25---87487094420.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4326c23---82699132813.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191123335040.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090716232773499.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161304d11e4d24---danonevigaxowefupa.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/65406416663.pdfIn PDF document text
    • http://vning.net/filespath/files/20210903161126.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_off0000c8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F7 10112 bytes
SHA-256: 91706007e7923ab1e35c9e3de4400e3b7fec74350127fb81ac4fad2dd54d49ec
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 15868 bytes
SHA-256: db6ac709af6b226c0967639a8ee1615252891dbb8bf1754ee6f7d113ab7c1647
font_02_sfnt_off0001082c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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