Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c4577fcbf85b74…

MALICIOUS

PDF

76.4 KB Created: 2021-09-14 09:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a799ae686bb5172c543f975a942cd666 SHA-1: c5059deeb2d5f5008c869c1b5e15732fe4df5cc0 SHA-256: d3c4577fcbf85b74580c510957b92488ca60a12536b801c4437e31e7ec6d9d12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://catamma.ru/uplcv?utm_term=what+is+other+in+my+internal+storage PDF link annotation
    • https://ww150003.linebot.net/upfile/files/20210908070452.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/47749589018.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/74027366417.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631287239.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/finurakasovobufeponewab.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/94121092389.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/44747761957.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zuxuwinamuxisanif.pdfIn PDF document text
    • http://chapelguild.com/images/usr/resurovebinafevatoxoxob.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/letukaxobaradak.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/71530078018.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/15312210008.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/97808833747.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/59238086179.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///45971201142.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/kukemufezutokog.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/zukesotujotug.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/45709360978.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/66814888926.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/lovom.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/58307351497.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/sarelijimakunalexesuku.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/20741896462.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/fudapapopelegujaredufit.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161396c7734f3e---36417650650.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 17596 bytes
SHA-256: 3975fcfcf83833b6d05380e6a1b17e88b4c2af9560a6b4874f17555a442095e0
font_02_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10664 bytes
SHA-256: 39e8a341fc8fc3ec40a976d42d1382567842db514ebabf55297e621751428ae1
font_03_sfnt_off00011a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1A 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa