Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6678c072fd49164…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 19:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56670a1a7e08ec544b861089fcd3440d SHA-1: 46f2ddfe4f6a5bb36e8fe72b22e4dc937ee03418 SHA-256: f6678c072fd49164e33593269949712bc45a82985a098181ba22abef9ee54ebf
166 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document's content, if readable, would likely instruct the user to engage with remote support tools, a common social engineering tactic. The presence of numerous embedded URLs pointing to other PDFs indicates a link farm designed to obscure the ultimate malicious destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://sireny.net/share/files/sazexuwizefudamugovebajen.pdf In PDF document text
    • http://hzqzg.com/d/files/88535267577.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/4708731101.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161310387bf96b---denagunivuvolofakunazum.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/31757935295.pdfIn PDF document text
    • https://eventaipei.com/upload/files/65820694557.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a674a28c3a---19922819637.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/75073398235.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/lugaruxaxotisimudegowid.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/73787983802.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/81445256819.pdfIn PDF document text
    • http://archbot.pl/files/file/semitusebiwuwikop.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/59019757803.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/73657562219.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/buwet.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907010255.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/segidofo.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/vodefurusilewakag.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/72113516249.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wobavalofepobimujubuge.pdfIn PDF document text
    • http://rurisnet.org/images/file/65666897879.pdfIn PDF document text
    • http://gazetavk.ru/img/file/2791774936.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/99231327087.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/garev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pubg+wallpaper+hd+download+for+android+mobilePDF 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_off0000dfa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA3 11004 bytes
SHA-256: 48fdc9739292ab3b521b4afd483f54c32faf8f6a3a6c92db752a85342cd71a6b
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 17628 bytes
SHA-256: 55d4bfdee09e53c683f1fab2396642244007ba0e59a89c19c2691c0b471d2d1e
font_02_sfnt_off00012622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12622 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1