Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d3f898375e0ce5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 23:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb75d7250d95e7939e1c3d4d9fd1416f SHA-1: 81da9842929600d81605cc32eb7ce83c4b9194b8 SHA-256: d3d3f898375e0ce5ce454ce06d48bb2a54c98345ab79261f133d1023e00e5ae5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious. It employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to execute commands via Win+R or a terminal. This is a common technique to bypass macro restrictions and trick users into running malicious code, likely a downloader for a second-stage payload. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://indikino.com/ckfinder/userfiles/files/rojikixutofonewa.pdf In PDF document text
    • https://fptica.ru/images/file/34766558153.pdfIn PDF document text
    • http://koala-al.com/d/files/rulon.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/nigewimeriwutudok.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/3585159484.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9ab3a370e---17091334991.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/16450450500.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e4f92a4e---zazutabavusobat.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/74981035481.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/jifebap.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/motafawikilokif.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/40420026640.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/71755804473.pdfIn PDF document text
    • http://azizolace.cz/images/file/zarezumoli.pdfIn PDF document text
    • http://lg-palette.com/upload/files/20006708666.pdfIn PDF document text
    • https://harmony.im/userfiles/file/xamunuwimekenukiguted.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/16302903135.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomosegik.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/96936874944.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/30685690730.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/ketibepaj.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/988963381.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vamixadiwuxumatedo.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/mekolivagogafapalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+requested+resource+is+in+use+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 16896 bytes
SHA-256: 2ec053dc5eecdc3a4794dce62f07daf6e3b306b4303a344c2124268d1bdf7f8e
font_01_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 10632 bytes
SHA-256: 11feeb355d676400214a0e5ac71a85fb1c00ebc7b05946e0706a1a80f994d1db
font_02_sfnt_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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