Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7ef5e44e742c33…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 03:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e070df6e07565f1f6a5ef3d5e5d9607c SHA-1: af341dd0a337a561fa9a8cab6a2a3af17079d626 SHA-256: 3b7ef5e44e742c335b5a0dc27be8d9ff48b200d0a114432a25a76e914c9a4426
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit vulnerabilities or trick users into navigating to malicious sites.

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 https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/99016593273.pdf In PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133915ae18e6---gevinuvijivevuzowabet.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210918202417.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/fejisifoxolobokob.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/daxipexegalasewujop.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/70020016350.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/25686787744.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/lufager.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/ripivosebapewosom.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/25603261662.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/80439145382.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/vavuruzizimalukuwebovaven.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/64666956813.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/43633085022.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/65637069795.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/rejepow.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/gowezepemiwodafogapuraxi.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090512260473499.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18ff3594f---10176140215.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lojogefigesizimop.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/65378948666.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/judoke.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/54184459619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=safe+io+gamesPDF 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_off0000b0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E6 10284 bytes
SHA-256: 6db5e61a424ac1a5024c6bc3bf589e5866149f414496df47206ae21700cb7451
font_01_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 15032 bytes
SHA-256: 58629b07728fee8a4c2888002e02048d2462b20831de5ade96f0129c94de455c
font_02_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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