Malicious PDF — malware analysis report

Static analysis result for SHA-256 80af7d707b2b14a8…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 22:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 583c434ea4658a16d073e885d0563e8e SHA-1: a46d6eaa4fd6f7d9d02e020b3b1fea9d589522ec SHA-256: 80af7d707b2b14a8cdeb117146f0f56586669702ccec16fc2ae7fb7aa2ee5d40
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URI heuristics and the link farm detection further support that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=family+guy+live+wallpaper+for+android PDF link annotation
    • http://boothbayharborshipyard.com/userfiles/file/zitewojupi.pdfIn PDF document text
    • http://teplospectr.ru/images/files/wexenukakifewigijun.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/fekareref.pdfIn PDF document text
    • https://tl-systems.hu/files/files/xigetemimowilolog.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/56444007758.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/modorepuw.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/83886513790.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/tabaweni.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090606452210.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kasozomuvinuxozepiwowaz.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/748k3tjanc065h2livutmfneah/34613572346.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/gekudizurusep.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210903_060020.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/10859505235.pdfIn PDF document text
    • http://pololanna.com/user_img/files/13125865428.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/makavumemabewowirojelelun.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/gulonunajonulifomubasu.pdfIn PDF document text
    • https://tcremich.lu/files/files/xiribup.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/vuritabobalepikerenuza.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139045a22c35---komovatexepuzeredafu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/69511768068.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/74504928486.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/21802361301.pdfIn PDF document text
    • 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_off0000c6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FC 10916 bytes
SHA-256: 989bc2ff9e2dca84fface0e3da1dfa9720918e19c78ff5eec8324e66fe6c0796
font_01_sfnt_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 17404 bytes
SHA-256: fe691df1c697c162c4857d496820ab57dfc4260b313dbd0f6743fea8513a04be