Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe852260f8f2a54…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 05:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3fa9a404b0dfee9cb10095f91e4ca5c7 SHA-1: 90cacba98f6bc27a49629e919e7851cf87af4f1f SHA-256: 7fe852260f8f2a54e87c176ef3dcd2c0523fc191a054885596b9b070e0ae7369
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. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting a lure for credential harvesting or further malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the phishing pretext by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=cheat+game+8+ball+pool+android PDF link annotation
    • https://asztromiskolc.hu/ckfinder/userfiles/files/53151369376.pdfIn PDF document text
    • https://digireg.dk/upload/lilidegaj.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/lejufedozotoxagut.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/89616681338.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/87222558879.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16142341ba2b8c---9092998883.pdfIn PDF document text
    • http://goref.ru/files/file/19378303882.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/77305227319.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/31143167986.pdfIn PDF document text
    • https://emmaushuis.org/pages/42379384787.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/zagaki.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/pujejumilisir.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/vexitomowufuxa.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/vodalupudasuguxu.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/58498446420.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a1eb0954---dujalulugabafus.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210903_785F066BD2BFEF6B.pdfIn PDF document text
    • http://nincity.de/inline/file/61835878466.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/36057764429.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/60446737086.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/vubiripetag.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/89869369398.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/59541955008.pdfIn PDF document text
    • 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_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 11052 bytes
SHA-256: a451a828170e54e24b2d9c27d763daf0e47b4bc60f98e8ed433ca1f00aa9299a
font_01_sfnt_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6A 18164 bytes
SHA-256: d9aabeb2fdd6e1ecfbe26b64ab3a6a5a145c0c29782d955235e1bb1d12ef6e59

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