Malicious PDF — malware analysis report

Static analysis result for SHA-256 d209cfb0ac13b3ec…

MALICIOUS

PDF

67.2 KB Created: 2020-11-12 22:23:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c77aeb73904ed2fd1848f48b41ae8959 SHA-1: 7239056b858659d95a69be59d53618c381dcd3f2 SHA-256: d209cfb0ac13b3ece2ef1a74579a5c545f09c8d717a3682e03dd3b7a23a51d30
302 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a large number of external PDF links, suggesting a link farm. It also employs social engineering tactics like a 'ClickFix' lure, instructing the user to execute commands via Win+R, which is a common method to bypass macro restrictions. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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://cctraff.ru/aws?utm_term=xp+arabic+font+zip+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f88fa10073eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367961/normal_5f890b18181b2.pdfIn PDF document text
    • https://norenepativen.weebly.com/uploads/1/3/4/3/134315866/368a3225.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/laxmi_prasad_devkota_pagal_kabita.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/circulatory_system_parts_and_their_functions.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/38480643691.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/93518229962.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/atresia_esofagica_congenita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3024754-bab2-43e4-bcbc-6e70ca65f8e7/71631607056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0190d840-a6f2-40f5-a3c1-b5e9ad4b46d1/20188926949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d369c58-d7a0-4815-975b-5cdd23b7239d/julevotuguvufufeziwon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc02bd0-d3a5-4119-b4f3-a32a8c5482e9/zizenekop.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/27988794958.pdfIn PDF document text
    • https://s3.amazonaws.com/tulosa/clinical_approach_to_anemia.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/47859362549.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/687f91a3-a159-41bb-bdbe-2c80d6fb8af5/29333665867.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/sample_company_analysis_marketing_plan.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 4964 bytes
SHA-256: 00bbf9c9620d0ea5d929df34af8deb2c24ddfa41dca45964101486a8cc0e8d3c
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10424 bytes
SHA-256: 7420d51a0411ae4deb6bdc3967ff3812910193fbb680141ff104de295a0bbe93

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