Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5248d781494dca…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 10:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2cfb6c4f9a88f62b6a04a9443fb00def SHA-1: afd27c2e464c90d2aff3459e8378bbf763a2bdcf SHA-256: 5e5248d781494dca7a6370d3bc8eaacdcaed875abd02d1c86f75081d5ecefef3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to other PDF files, suggesting a link farm or distribution mechanism. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a likely attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://gamax-motor.cz/data/dokumenty/xagos.pdf In PDF document text
    • http://szjglaw.com/uploadfile/file/2021090411511473499.pdfIn PDF document text
    • http://flirdining.com/uploads/files/83434509446.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/sibubetigemokoliledi.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/fesorulodisuluzurifa.pdfIn PDF document text
    • http://hueide.com/upload/files/zozulelu.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/34938849127.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/29982050663.pdfIn PDF document text
    • http://christopherdallo.com/file/ravudataturu.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/wenilurafipolazosow.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ad13ilj6i1gjohsjg539has6j0/78221783045.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/seteposapab.pdfIn PDF document text
    • http://www.moyekolodin.com/files/manuvevomej.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/bss8pdm8hfemm93tgdjp18knhj/34074306700.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/xelagasobiwuza.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/98371777730.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/34562091741.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/97791685004.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/27242489355.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/31277166746.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/raxifasesumodeladiz.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/75703395060.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/77163927739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=forza+horizon+4+android+iosPDF 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_off0000b7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 10184 bytes
SHA-256: ec1e3cea7552ead658f4e5af70604c367de5828cccdc93af7441bbf4866e3c6c
font_02_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 16312 bytes
SHA-256: b7430055722d641cdc091123115c9b23a9746cd1c8d75b923c914264d3b85e93

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