Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8994bcaffe2ba9b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 12:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f54516927fe96b079f622c921018c21a SHA-1: c13014f62c4173092c3b71fe0b859686d6c177d0 SHA-256: e8994bcaffe2ba9b73daeb778254fbcfd496a688a75f36e5b3134175da0a7e30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=bollinger+on+bollinger+bands+pdf+free+download PDF link annotation
    • http://patp1ryb.ru/media/file/dowobojokaloni.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/27109202290.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/gunapunazigif.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/vepisusanapel.pdfIn PDF document text
    • http://vejwun.cz/images/32656609558.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/nitenufojuto.pdfIn PDF document text
    • http://rayer.cn/d/files/33672769762.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/rorobado.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/zifutomitaduzug.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/64471238276.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/wajibakugobimexinajebozid.pdfIn PDF document text
    • http://insei.eu/userfiles/files/39167408753.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/rekirifaso.pdfIn PDF document text
    • http://pileki.com/imgup/file/keweloxemibefez.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-2/20210902044844106997.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/wumuwiginibifirizagulam.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404c7acdaea---80540110878.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zapawasoxarok.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/8505795426.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/faxalobepezexazen.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/45766338129.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 10852 bytes
SHA-256: 601e9bb8b315e3bec0b9ae6973cbcf3b02b9708c9f11fd8c628e2d58a2872cef
font_01_sfnt_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 17976 bytes
SHA-256: ba34e4eb0a3e572316d6da69a71bc2a3fa11149f9b261a81b0b2262c0fe78403

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