Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51e3e15d1d3cc60…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 03:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8abea24a9035c6a4c0aa9b42b4443b2a SHA-1: 56f87c338a9fb98fe4be3c00afb3ef041bcb5350 SHA-256: d51e3e15d1d3cc60f2feb5b3e97b26382673d281e8358193a733110977394b81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one specifically pointing to a URL that appears to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=how+to+turn+on+permit+drawing+over+other+apps PDF link annotation
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/55609770585.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/57542109437.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69776422271.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/32278262979.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/87396642890.pdfIn PDF document text
    • http://mamitobe.ru/files/file/15651753563.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/99009301788.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d36617ead742cebff2f2fe8d526112ec/14537530123.pdfIn PDF document text
    • http://vejwun.cz/images/34815412486.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/28144741649.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/82216068581.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/60090846909.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/diribavotovi.pdfIn PDF document text
    • http://perksys.com/userfiles/file/53517007045.pdfIn PDF document text
    • http://school15-tyumen.ru/f/16609249191.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/vafuniwunepusizesalober.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/vasuletamobopopuzotig.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/fosozemipoveluzaribosidup.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/fizetigexadalubef.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/5181879586.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/nepogixekufewizidovasas.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/47459858094.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2cd4b3ae5---fatarofelevuparijitirifaw.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_off0000cadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 11036 bytes
SHA-256: fe0746aff89ce540d9cee47fbead2eb3e0947429d9619fd73b48e4cf7ba9086a
font_01_sfnt_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 17296 bytes
SHA-256: 470118d3de1b8d9d572bb67286926c80108b757a98e03038862c4fbd0a38ecfe

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