Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb4d9a7584c4359…

MALICIOUS

PDF

83.4 KB Created: 2021-09-24 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da455848546d55cad8c3186f2fe3bf40 SHA-1: 16b19d06a5174bbb1598e922dfb4774133d70208 SHA-256: efb4d9a7584c43599f5a4d1e1d23cccf6d08a4bcd4196b2fa5141c44eed44819
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/927a3b2426fdbacbdacf70068acac455/xiwiranalinarugeku.pdf In PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/47269478601.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210920210220_so5e1g.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/sifujowaritagapovapo.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/77565238394.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/21415411789.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/wizowavolalosaniri.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/tujeloloxarejug.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad863f1096---varazanagizogofavadijurib.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/tuwobodaxitotovivavupal.pdfIn PDF document text
    • http://infunplastic.com/d/files/11357379626.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/wujulinoropogimoleligi.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/1832980817.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/kekimub.pdfIn PDF document text
    • https://sapporopools.com/contents/files/98093566338.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/96803293723.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/sodesipugibenelevuragozu.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/86184890912.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jitolunegawejogukezitokud.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/26045450438.pdfIn PDF document text
    • https://reha.bg/content/upload/file/setutubibig.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/269571883.pdfIn PDF document text
    • http://origo.ws/userfiles/file/zejenozizonewezakuj.pdfIn PDF document text
    • http://surausa.com/uploads/files/judorutaviwakoxarafabo.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/tonujabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=punch+hero+mod+apk+free+downloadPDF 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_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10808 bytes
SHA-256: 83b76fd3f8cb62bea290e5f46ba328eb3db7dbf2f63d376c2c51d5e378a47feb
font_01_sfnt_off0000f757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 18600 bytes
SHA-256: bca4663d57a15bc735f8ad46a2f8b7cd53f924464639ac473dc9cffaaa4d8458