Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3615c0a45bdfb27…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 18:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18bc7460a02bfe65a43572f19f3f93ff SHA-1: 1062f8d4efece67088e456ee8209a40bc630a621 SHA-256: e3615c0a45bdfb27f3a858c13691aaaed6dc9bab62b332e1f9487ac608905788
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous external URLs, many of which are hosted on potentially disposable domains, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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
  • 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.
  • 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://tonthephunglan.vn/upload/files/48588328348.pdf In PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/topuxixavar.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mapejusig.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/9788105892.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/67923313457.pdfIn PDF document text
    • https://toocapen.com/files/64841394489.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/28346568138.pdfIn PDF document text
    • https://fultoys.com/userfiles/fumipesadiv.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/kogun.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/lenevuri.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/88643075732.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/99395020096.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/magetotixuvifokolukozen.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/venezilenisabexok.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090500280373499.pdfIn PDF document text
    • https://coil.hk/upload/files/94320872136.pdfIn PDF document text
    • http://superazs.ru/images/news/file/60851179777.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/66988743033.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/kozokuwizafufojumut.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/wepatisemozofeso.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/4263343788.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/kurukinotomixumetaga.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109151237456862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=install+twrp+recovery+without+pcPDF 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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 18164 bytes
SHA-256: 0d7066550025fa36d81789a1a2675d1ce54a92da231a95e257f7e13f041beca6
font_01_sfnt_off0001085f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085F 10788 bytes
SHA-256: fd5f7db9509169c06e79765326b066b87d21d394f913d7d67c28be788668b291
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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