Malicious PDF — malware analysis report

Static analysis result for SHA-256 89068a2cc28fdbc9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 11:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 454d2f18c6849e0b53548c5620671d28 SHA-1: acac5eb863bdceb25064301dced8434f43085ebc SHA-256: 89068a2cc28fdbc9c46bcb6f72fb53f3acb1230a178102cd301d500d8d2452e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://eaas-journal.org/survey/userfiles/files/19699428119.pdf In PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/fuzokuredonorikerubum.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/83592261199.pdfIn PDF document text
    • http://shamayachts.com/upload/file/revisofiru.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/69229318343.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/44967250188.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/vodozozagisawenefezavubux.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/biriweb.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/49687097796.pdfIn PDF document text
    • http://webantikvarium.eu/tmp/gosutupebubeduximadixida.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130123643bc7---linivunufatifaxoletoru.pdfIn PDF document text
    • http://yibetter.com/data/files/40535248540.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/giserobilajotiradun.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/91993944119.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/92547322443.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/33049062086.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/rutagajotavoxurelajelet.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613135fdd132b---81948510004.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/gotilenutuvemasemes.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/karizorafeparapafabi.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/46136846295.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/suxur.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/vuxovunemojosanawigez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adb+screen+recordPDF 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_off0000b2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E2 16736 bytes
SHA-256: 8a8e7e64b4c5a0b9134ebfd6d6baded85553f79cee492fccb322a906814b34a5
font_01_sfnt_off0000dd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 10084 bytes
SHA-256: 356ee60a924a75d08b0b243df9145f313398ada38522748ed1df27d287c89867