Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc88bcd60e8e0cf6…

MALICIOUS

PDF

123.9 KB Created: 2021-09-18 15:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dcf5235dbc891558efb6e2c42cbcb53 SHA-1: 68749909f1239a98b2eaef6308167785894e91c8 SHA-256: fc88bcd60e8e0cf6b4d822986d00346c9c310c00872bb52108b4ba497b39affb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it uses a social engineering lure, instructing the user to install a browser extension or update to view content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery. The presence of multiple unknown URLs associated with PDF files reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mabuksusu2.com/contents/files/zodalefaneroxowipuxabe.pdf In PDF document text
    • http://www.blueoak.fr/image/file/56920821868.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/58609864035.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/lekida.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc074a9a15---sekovi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee8b4bbad2---jotimepenukanibewifubizir.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/jepezesamogexikeselod.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/vuzulanaj.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/48257415188.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/kidokazezejetok.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/98724351559.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/lopifimulapatefuvasomi.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/36386439830.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/rarukilumajogolonen.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/41007933419.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/84909940268.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/69798770681.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/49995417606.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wabibamiziximijo.pdfIn PDF document text
    • http://klinok-saintp.ru/files/lerinawanegozaxakarumolig.pdfIn PDF document text
    • http://aminotp.com/upload/files/lipaxovikimugo.pdfIn PDF document text
    • http://askort.pl/Upload/file/lekikinupoga.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • https://granitnet.hu/editor_up/bowatevalezolodezirepam.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/vepewomigekonijikapu.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/34113540993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=audio+tagger+pro+apkPDF 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_off00017cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CFC 20084 bytes
SHA-256: 95880d5b6a23b0f6c0a0d70f47f8898c0f85c2292174f8df73ff26fecb9936e9
font_01_sfnt_off0001b0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0B9 10424 bytes
SHA-256: e58c5941208eba3eae9505ffe91921391bdad0af684027d82474f2d600c325d6
font_02_sfnt_off0001c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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