Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00e13a86a03cc7e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 13:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce262322f71c309ef703fe00b86a9552 SHA-1: 7da5db00efb2aa9cf0ac7900cbf1af06b565ea55 SHA-256: b00e13a86a03cc7ec63c2732e27c053ab15c8891d4700e5f145bfbc9b184ff49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate a high probability of malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://blagoustroystvo24.ru/ckfinder/userfiles/files/55996947713.pdf In PDF document text
    • http://scvumaichiramen.com/uploads/files/4486589593.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/rajejawetawedewusewuv.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/15353561521.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/61594670251.pdfIn PDF document text
    • http://sjhtractor.com/d/files/wenibiroxepegofepuzu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437d0a87eb4---67445176048.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/vezewumab.pdfIn PDF document text
    • https://sealskinz.ru/files/file/64756755514.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/laloravewowirijamoti.pdfIn PDF document text
    • https://exhibitproplus.epponline.com/mentorfinancial/page_images/file/puburidesojijodam.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/90573343308.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/28191044715.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/weriwafas.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/62929344402.pdfIn PDF document text
    • https://istanajp.com/contents/files/kejipimenikaruparoxix.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/54197047460.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pexegojisofakonu.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/78457350701.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/52083117428.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/semewurepuzisuwedexu.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/74807442341.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b8c1b804c---12536534548.pdfIn PDF document text
    • http://grimastone.ru/files/kiril.pdfIn PDF document text
    • https://remini.hu/userfiles/file/xelavabapobagox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=kgf+kannada+movie+full+moviePDF 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_off0000bb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD347 10580 bytes
SHA-256: 0609722b2f621f2cbf093fca0b8443053c8ac4dd17958fa9bf383dd2a8e96cbb
font_02_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 17408 bytes
SHA-256: f78f2635f2da84b45d557e4c26adb6ad46672f7065fbb03983bf219cf73ffb61