Malicious PDF — malware analysis report

Static analysis result for SHA-256 09758540ecdcfe2e…

MALICIOUS

PDF

77.4 KB Created: 2021-04-07 01:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f5ad39c76a9a64f7da851229adf59cd SHA-1: 8e64a0c181f3a695539916409db65a019a76efd3 SHA-256: 09758540ecdcfe2ed5fb7412f20a2d3af9b22c4109a94f1becf9e85d9858e7f5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The document contains a link farm with numerous URLs, many of which are hosted on disposable domains, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_CALLBACK_LURE heuristics further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://pilgrimland.com/sites/default/files/webform/resume-uploads/40494538869.pdf
    • https://www.termis.org/system/files/webform/dexifivoneput.pdf
    • https://www.a1touchsolution.nl/sites/default/files/togivem.pdf
    • https://www.jwico.com/sites/default/files/webform/41164207556.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/nolukaronedibikix.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/buvonajevomowetizebijix.pdf
    • https://ambrose.edu/sites/default/files/webform/28695523124.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/pakajumotarowumomudiro.pdf
    • https://www.mainephilanthropy.org/sites/default/files/guvobirewuge.pdf
    • http://klm3fg.grhosting.cz/sites/default/files/webform/files/16831560309.pdf
    • https://www.woonsocketri.org/system/temporary/webform/makepepatamizozixijefawop.pdf
    • https://www.jwico.com/sites/default/files/webform/xojisipet.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/80982398497.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=starting+a+small+business+in+south+africa+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e187.bin
931f0121dc0c1c0414bb3cb71200cfec5cdb9e7d250b99b8f6936aedcdd14438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 5812 bytes
font_01_sfnt_off0000f516.bin
cb159cc9d714520fdf604515834a8e5d6ccdf81551317d8133b939af7313f940		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 6068 bytes
font_02_sfnt_off000104c6.bin
3ab7e5b94b7fcabe28040327359d37a81fc98d8f05bb692315ae9ab223aa6768		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10652 bytes

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