Malicious PDF — malware analysis report

Static analysis result for SHA-256 81445a222edcb3c1…

MALICIOUS

PDF

77.7 KB Created: 2021-09-13 08:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5aafa9ba7c3f04e3d536b324462d4725 SHA-1: d66346e08d6a716d0546933e23e955847720c6d1 SHA-256: 81445a222edcb3c135adeeed4a870314c9457466a937881809f1341b482a4e90
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable domains and a lure for 'gta 5 for android' suggests a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://elektro-galerie-hamburg.de/userfiles/file/pufur.pdf In PDF document text
    • http://web300k.com/upload/ck/files/nafawixuwidivipobag.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/92875242996.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bd7de5f18806a5e0f4af74c2bf949f83/26025172278.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/86454150024.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/zemejatifon.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/73615792459.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/57325663618.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/zakefolizevusovozubafuki.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/bafurukuf.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-4/20210904210823487531.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/foliki.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/gotibiduxasibosuromuloj.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912133645952.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/paroraxivawowub.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/babakoganogipakuji.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/26296856051.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xiruwuminufusoje.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/696080843.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/98113607886.pdfIn PDF document text
    • http://th-hl.com///upload/files/97268765017.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613614407719e---34558065659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+for+android+full+versionPDF 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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 10684 bytes
SHA-256: 42b552f0ddd111154363826ee518befd14ac14a48faefc903bfdfd5c460dc74a
font_01_sfnt_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 17124 bytes
SHA-256: ceb6fb997369749cf7a928205a181f7a032881082a7b134ad24503a66696ce52
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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