Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dd9f64437b80d7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 17:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c04edd27b827bb26050884e24864749f SHA-1: 12e39a52c8d2168ea43852f9c0bb41fd02e8851a SHA-256: f6dd9f64437b80d7413ebbf27a8619fa007858fd139f2ca25a43b2f6c2561b2a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, pointing to numerous other PDF files. While no scripts were directly extracted, the nature of the link farm suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://b40555.handyfriendship.com/upload/files/92301524825.pdf In PDF document text
    • https://riwg.in/userfiles/file/mulazikemevotu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/wuxumojubuje.pdfIn PDF document text
    • https://ptogel2.com/contents/files/98250614535.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/mubewefaxijabawapapakax.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/47807811528.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/117162178.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/16922599289.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/galavavuxifofotibaweraja.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/70952272420.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/22207173485.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/64562013398.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/32651303718.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/52254081370.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/18101890766.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/28339407662.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lonitojinabojatu.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/matuwulilelenamekewexatig.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/61537520675.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0c5bdfe572ca1c6b646d3107f86cb613/mipegemabirigimu.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/jabovaduvakakalanija.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/7434585981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=virtualbox+android+wifiPDF 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_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 17732 bytes
SHA-256: 7a825059a398a3ff19297f12ae85ab0c7336baa9ba753bd0e10fba657d16a7a7
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 10444 bytes
SHA-256: e7b609e8fb9454e0b501baca9f49d0ff020bc649a7b29b6a52f63d4a94b9f741

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