Malicious PDF — malware analysis report

Static analysis result for SHA-256 70701f07f2825def…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 18:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65476aaebb1e94dacb58e8b5851c5044 SHA-1: 4f910cccd12f4b1b91a328ec4edb9b4681f46c9a SHA-256: 70701f07f2825def5c28e074e6d1138bef9753ee0b91927c9917ce5f4d92717b
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to PDF files on potentially disposable hosting, suggests a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a network designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sushistoryus.com/uploads/files/jotorapetelajugizamo.pdf In PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/99995449528.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/zevalezobudugazetupudo.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/30923384476.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/21722224188.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109011227509420.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/21b879846a247f9ebaef7b99b58934b4/negetizakumogerikavexu.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/8134729571.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/duludakasobumos.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/belenizigawumi.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021913208398680.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/walepotubatageduzubasut.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/nasisefalalibi.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/vafenexibudelot.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/wagizoxebefasatew.pdfIn PDF document text
    • https://hoongnau.com/upload/files/rowazegesu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dabifujumixo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/79461119878.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/domutowusu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/5079087864.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/55149138923.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/novipekatevijetofip.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/makoxuroxurijesavewaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=gloud+games+hack+modPDF 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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10652 bytes
SHA-256: 5d281f7d7161956ed46fed911450e5ffe772aad446e68f1ffcf45052d68c17f0
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 18320 bytes
SHA-256: e7ac0c2977ec24ba4ba0749893a45b8c4b948835346be11bbb5de597059c6a87
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1