Malicious PDF — malware analysis report

Static analysis result for SHA-256 917dc3a719d1b9a8…

MALICIOUS

PDF

88.9 KB Created: 2021-09-17 03:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d86183697789bec82067d8b86e8df03 SHA-1: 09636404e50152126a554ddceec7b303f517e6a6 SHA-256: 917dc3a719d1b9a8d5a1bdd5d5b4ab4d3ca60b5c8a7466119980afb09a58416d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded links point towards an attempt to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adsbudget.net/userfiles/file/punenikowafugutiwapa.pdf In PDF document text
    • https://hoakhanh.vn/uploads/image/files/4326217753.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/setisaduze.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/naguzetoxuxenut.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/seloluzavafidanipebutu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/17219982963.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/xalewutevusiti.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/fomisojazavoxafezedifevo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6da3260944196da518448386c09a360e/56892458491.pdfIn PDF document text
    • http://indexone.ru/upload/file/2834274095.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/buxirosowofinelaxelof.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/66420624398.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/84587310124.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/mozopozizogapuwu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/solofiribudusobivuxasujo.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/texibejorarowasapepajo.pdfIn PDF document text
    • http://halanmilk.com/upload/files/52011804104.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/jidoseros.pdfIn PDF document text
    • https://lapakunited.com/contents/files/97043595545.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/18130047262.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/38365378442.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/54778957877.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/21301322260.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/ramonetetexo.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/98626492811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+backup+redmi+note+7+to+pcPDF 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_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10920 bytes
SHA-256: 42a2fe24270167238f95a03ec346e00c3900b7bc6462878fe9146f24d90fcb71
font_02_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 18064 bytes
SHA-256: 273db499874ff29736b9b087619077857b75d5e6164916c14ab3fdf2d3679715

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