Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4c2c786c5afd98…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 13:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0f2eab40b035091e051d713e55ab64fa SHA-1: 37262c7c0e545cb75f5a23c7d8b657d86d7c8db8 SHA-256: dd4c2c786c5afd9803c40be22c519aa14cb9f674a6059787dcad86d8dbfe44ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external URIs, many of which are linked to disposable hosting and contain terms like 'free movie download', strongly suggests a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://upservice.expert/admin/ckfinder/userfiles/files/jorejuza.pdf In PDF document text
    • https://edgecs.com/documents/69213059394.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/1551918864.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/sekatef.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/924cfe68fe96e6cc539d79b888fdc048/nadobewiw.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/vowojodejilalazorunebeko.pdfIn PDF document text
    • http://cartopack.be/Images/file/gofumom.pdfIn PDF document text
    • http://teplospectr.ru/images/files/75613158371.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/bifawo.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/99191120876.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/gewuku.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161495b0679853---41017766957.pdfIn PDF document text
    • https://aneri12.cz/res/file/fojus.pdfIn PDF document text
    • http://inistor.com/ufiles/files/vonezopojaxizafumuv.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/divujewapifegidilu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/sosurija.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/rumejirazo.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/97041182721.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/48894539263.pdfIn PDF document text
    • http://prmakeup.com/Image/files/tadoku.pdfIn PDF document text
    • http://biomehl.com/images/content/files/kowolovotuniredik.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/83599272313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+movie+download+karne+wala+appPDF 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_off0000af3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3A 10508 bytes
SHA-256: c5e1cd0a73610754a7c61e5cd4119d3828b94813923c7b50592d208a79e2545c
font_01_sfnt_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 17632 bytes
SHA-256: 999e1142bc7e0099002c78adcd281dc4cc5a17ba0194941a06e55a9180a9c5ce

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