Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f920e5ec79489b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 09:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f419d2e313e96738764df9cdc46a9b4e SHA-1: d2cb8cc5d5b1a447293eaa0c9814f407b01895f9 SHA-256: 66f920e5ec79489b58f85794019cb4ea7dfd9d7db9c3fe108e48d3a67ae97c61
146 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm or phishing lure. The embedded URLs, such as http://ghettaetamionarchitetti.it/userfiles/files/xejisujeromorovidi.pdf, are likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users via social engineering, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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 http://ghettaetamionarchitetti.it/userfiles/files/xejisujeromorovidi.pdf In PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/25450706132.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/45020504339.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/52298928668.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/24567705809.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/7154458278.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/mubux.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/fumugizuzeneraxojoxofivox.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/89273475500.pdfIn PDF document text
    • http://hzqzg.com/d/files/tukabumipiruga.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/5482956267.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/88213747815.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/32484395838.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/vegojuba.pdfIn PDF document text
    • http://chpcentre.com/files/file/xofebitopo.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/lowesadu.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/datefusezepijono.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/87024703013.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/vusaxeditazuxo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/wobozobiwosexu.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/6239495991.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/62029189588.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/21859167739.pdfIn PDF document text
    • https://inprovitbolivia.com/ckfinder/userfiles/files/rukomopowuwaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=free+fire+new+update+2021+mod+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_off0000ae65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67C 10996 bytes
SHA-256: 9d16671dd9b03af31dfb415196ac9421210b381a7fdd2241d94daedad16acf30
font_02_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 14992 bytes
SHA-256: ed0b819fd4784e437a9405d0c660bf866a406ea7a5a42a58af12b1c19e327ed9