Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a37476e810309fe…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 12:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbd9934066f623bd74291d0f6b0c7d88 SHA-1: 30af510f5fb8b4b78871e065598561e17075d0bb SHA-256: 0a37476e810309fe3ff2994215e9305e887e948dfb0783191469b7bb408fa5e4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URLs, many of which appear to be part of a link farm, further supports a phishing or redirection attack pattern. The embedded JavaScript likely attempts to download and execute a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=convert+cm+to+radians PDF link annotation
    • https://nbc.com.vn/ckfinder/userfiles/files/totowaxikevavilex.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/fidefanujorabukave.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/63929338656.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/67201216963.pdfIn PDF document text
    • https://csn-alliance.com/data/files/30361749342.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/2772507389.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132719e1a95d---xipisi.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/44448941792.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/89572548169.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/35599216261.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/fobet.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/lijefupopubefuf.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/39535760455.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090109053273499.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/46426408896.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/luvovirovuvokoponazuku.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/dulavukanupapu.pdfIn PDF document text
    • http://atya.eu/files/file/koravopulusawakugadati.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/bupaxavezavuzetuxerade.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/tifidagivewusizabe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140f9ca20dcf---44394823998.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_off0000c66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66F 10580 bytes
SHA-256: 927e517fa6a1a76d55dc48d7b9c05dce44d25a481befbb4832f497498703e1f1
font_01_sfnt_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 16972 bytes
SHA-256: 8bbbe99a38d99eeb065883306c2f2e978f3c9e9dddf25f7c589383d7bd587e4e
font_02_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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