Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e557cc433793d8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 10:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aae0b949b9c78f6ca6dbe82a2c34d9f SHA-1: 9d25f6eae64f5f7aaec96efe8f46885c558b12aa SHA-256: a6e557cc433793d866a265e60d7aca1a2a518f33269579a77daf22f93b736ffb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cafemocion.com/userfiles/file/buvedexujunatofivizigixuf.pdf In PDF document text
    • http://energo-market.ru/sadm_files/42293533308.pdfIn PDF document text
    • http://foodchemsino.com/d/files/sugowetenigijaxalavuj.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/69051298675.pdfIn PDF document text
    • http://ametansk.ru/uploads2/nenevewevukuziwum.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/sazotomiwubuxepuzezu.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/25597488468.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/82522730247.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///xiwesomedodizez.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/10891421901.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/79018179010.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/37097363984.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jupilamelam.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/dekegasiwowesevanitisa.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/79866246830.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1613addb73411a---raxipowabufimo.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/67218748021.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/tijujugifebotilakijaleke.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/sexaba.pdfIn PDF document text
    • https://plasy.com/uploads/file/dozel.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b2fdca1f---woridazutusaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=apps+like+retricaPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/dupowujakabobonid.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 10216 bytes
SHA-256: 43ac3fa15e10f650ed8de98510c41629f214107b392a256a8ba22df2c925a83e
font_02_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 18240 bytes
SHA-256: ac0908b7391555f7109d5f6a947919859fbe09d96857329ad9a1ed5d87a8e9b5

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