Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1796229a118aeb9…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 10:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aea798e27234a482591a4bb41df917d3 SHA-1: 61a84cb7aef9338d257e6b589f887c07f1d3b8e1 SHA-256: e1796229a118aeb9b0de12a8cbf8830fc5deb5a06d9847ce9efdabce39985438
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by an ML model and detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.salac.cz/ckfinder/userfiles/files/51436543021.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2d01275e2---bapixizuno.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/jomosirowebepu.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/zadadefubire.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f957751d9a0ee2614ece238358416e8a/fidivekibeferuwola.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/41703285389.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210923_20B0FB81144FE05D.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/zuxukaxegasadimazu.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/foravefalafavis.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/daputedelaxumiti.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe25ff0674---40840489257.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/76289506115.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/22151107929.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/lofirun.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/woputanaduzemutorap.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/262942721.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/90106130391.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/pizolewunubiwupalu.pdfIn PDF document text
    • http://modero.vn/upload/files/15269707313.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/pedotusul.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/darenadelasumupenakivi.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/41753853053.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/xamodexadiretifetite.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/22719885683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=settings+for+talkbackPDF 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_off0000b30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30A 17108 bytes
SHA-256: c9f312d03160dda3cd07bfb8a0fff17acabcabffc70ab2c6dba6ef66f0ab4c3c
font_01_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 10816 bytes
SHA-256: 47f296d15bb2b9175e1849ea24130387975f25a110b928a0e5da49165042f95f

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