Malicious PDF — malware analysis report

Static analysis result for SHA-256 2527b6a12836d891…

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 15:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4f2a21f0f01f41e2716188c8c08dc0e7 SHA-1: d885172d1e3d262f33dbf48ffd877e986e4f1410 SHA-256: 2527b6a12836d891346c8658cc90ddeb5d270596de17cb28ff245eeb9052d7bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URLs, many pointing to PDF files on disposable hosting, suggests a link farm or distribution mechanism for further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=live+wallpaper+messi PDF link annotation
    • http://hc6999.com/userfiles/files/pirebuturiw.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/xesefedodesabaz.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/29650835153.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210907212201.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/29707534905.pdfIn PDF document text
    • http://lawngo.net/fckfiles/kinajuletevorijilidin.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/bajarejimenosulaxo.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210905191033_uz24i0.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/35491097506.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/40020917280.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/geguwusozifid.pdfIn PDF document text
    • http://e-district.org/userfiles/file/61914207134.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/49382010447.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1f036b8---94921307424.pdfIn PDF document text
    • http://zerosquareonline.com/file/76519461842.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/78287303098.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/94842422766.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/julofu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/nexalurowediletopow.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/43243692094.pdfIn PDF document text
    • https://seger.cz/userfiles/file/50722338941.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/visup.pdfIn PDF document text
    • http://emannsltd.com/userfiles/62942600033.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/gabobolomurifikelenox.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_off0000b8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AA 16588 bytes
SHA-256: 9e0a413126c20fe8b445935e1412517e25c2ab54f9cfe888d4488960218b3685
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 10200 bytes
SHA-256: 180b26fc58df02960c76aab7d18a57cd18a4066e471a27e229c4a42b90945f89

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