Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec26e3cac5b6a599…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 19:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03b653c9eec7b31c2edd1acdbcafeeb9 SHA-1: 6c73da35649279ac0e90bf622c2197da391f597f SHA-256: ec26e3cac5b6a59970e661b88f5dbd0cb1a7ae1b9955b2e48117dfb719ec7d82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous URLs were extracted, many pointing to potentially compromised or malicious domains, suggesting an attempt to redirect users to harmful content. The document body was unreadable, but the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cliniquemyo.com/userfiles/file/38129040124.pdf In PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/xokinoliwokodavexogata.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26931332833.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/20356389225.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/25964664689.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/dowiwoxowiwirejuxa.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jimofa.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/603878199.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630455618.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137c93a8a505.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/nomabegitabefexalifezopin.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/73149901408.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/33355013037.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/27337223854.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/pepitilidadedepatebuginow.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/81166401794.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9f76854c---63374677536.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/fazupumewurabupetexu.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/87093416120.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/sotusosofeb.pdfIn PDF document text
    • https://aedwea.com/upload/foto/jewelejorejozat.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-12/20210912174247567642.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/53500368723.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/44892784854.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021991849348777.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/vebewojijorimitiguxabow.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/libesobivodimokiwafebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stopwatch+widget+androidPDF 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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 10740 bytes
SHA-256: a993490d82a74876b0b54b50e9d692d26ad2b1b1167836fcce48983e6675dd98
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 17156 bytes
SHA-256: f06652a570d94388da19a022810c97412356d21241231ef7f7b45b082b474c47
font_02_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1