Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47d76da64847b1b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-12 02:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 820256473f3f2efa19767b6e8adafa2c SHA-1: e3983a67e1f0a7a983fa29c1ae8effffacef443c SHA-256: d47d76da64847b1bfe4c51f7a3aee12967bbe3840223fbadcf7a0c129ae5bc7c
254 Risk Score

Malware Insights

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

This PDF is flagged as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of heuristics like 'PDF_RANDOM_URL_LINK', 'SE_SECURITY_BYPASS', and 'SE_PASSWORD_ARCHIVE_LURE' suggests a social engineering attack designed to trick users into downloading and opening a secondary payload. The embedded URLs are likely part of this download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=idm+latest+version+free+download PDF link annotation
    • http://kpghomerepairs.com/uploads/image/files/59148495603.pdfIn PDF document text
    • http://africareview.in/userfiles/file/66180444685.pdfIn PDF document text
    • http://ceroki.com/image/files/ropukenufipuxujivibejeze.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/58424918947.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/66755183569.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/sepisavedezanusopepejoda.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/99890046798.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/9701221083.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130fb02a6227---dizofepo.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/worupisatoviz.pdfIn PDF document text
    • https://emenu.hu/editor_up/mezawev.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344c2f64507---dobilivisijubuselivel.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/67682572510.pdfIn PDF document text
    • https://best-label.com/upload/files/taroxesuzipufivaxetegafo.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/12686807477.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/88556180181.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/68493444629.pdfIn PDF document text
    • https://soechi.net/userfiles/file/85223349659.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/97695034121.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/64317916458.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92525780369.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/devokikebexozi.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadoxukuxila.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/21805322878.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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 10616 bytes
SHA-256: cc9ea58d0655351b9bef51bfc8806b8c867d9712db92770dc5d70d2ac7f1a5ab
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 17860 bytes
SHA-256: 388d2fb2be0d91fb2821579e4dd352997da8367b12f0fb200fd89ac32938d3b2

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