Malicious PDF — malware analysis report

Static analysis result for SHA-256 2474c55c1b7148f1…

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 04:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23bdfda808c040dbb5766ef864a5aae3 SHA-1: 23368db8d4f94cc2317d169eac0553e2f8183aa7 SHA-256: 2474c55c1b7148f12f98ef9be25e1fb60d1f0651fddfd4f4eb0b6e7c30693a40
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme to deliver a payload. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://goodline.by/userfiles/file/99000782484.pdf In PDF document text
    • https://go2germany.ru/files/file/43251369140.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mutidapuf.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/dotakanisab.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/suwuzuxekupima.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/potif.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/87252358924.pdfIn PDF document text
    • http://punaide.com/userfiles/files/95659826512.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/10597449257.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-13/20210913075216668853.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/6387195274.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/90401179314.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/p59n2c5anbbed2adjui8fbh627/86659427120.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/xekenijijofit.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/rokadozizulumimubi.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/57417505544.pdfIn PDF document text
    • http://cochemical.com/upload/files/44551584328.pdfIn PDF document text
    • https://thietbigas.net/media/files/82241871367.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/41983245690.pdfIn PDF document text
    • http://apothepharma.com/upload/files/romuvepusafu.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/49834679151.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613729f60499f---42612354391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=asphalt+8+drift+racing+gamePDF link annotation
    • 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 18392 bytes
SHA-256: a8f4269c64360cc0a265e9c188dfdf14bcf9b82358651f0054654b20264e7bb4
font_01_sfnt_off0001164c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164C 11136 bytes
SHA-256: 058c267685c25e4e87ac8ebd53639ed2c6abb8ddd2a76444e2ac1b7dda294c98
font_02_sfnt_off00012ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16404 bytes
SHA-256: e4fe3401c7d34e72296e7b7119c523249f94e332bb87ce4f2ccc6fcb59e5addc
font_03_sfnt_off0001469d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1