Malicious PDF — malware analysis report

Static analysis result for SHA-256 8171666abead904e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 05:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bcb141094f43829bb46892ede4b4090 SHA-1: 5d0954ee48f75cf1a3986edef08486cb701affae SHA-256: 8171666abead904e9cebcbf18ad7d3ba281387af990bc6a9f4fedc7bdc727c34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution attempt, likely using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mingmitrcoffee.com/user_img/files/wunazozumozu.pdf In PDF document text
    • https://artinterior.bg/userfiles/file/27793788064.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/3495636993.pdfIn PDF document text
    • http://szpk.hu/_user/file/didijuto.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090400520773499.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/wufesavizama.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/14802267385.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/falifalezesex.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/wulenalawerolofagabo.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/fizizopifewifonufe.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/depunexakubiruravaz.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/mulufizupepefep.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/98148745122.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/tarofugusol.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16139cb6c9ac1a---55670069694.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/sugutob.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/wegupoboribunemurame.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sedowetorabikul.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/18312071478.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/nimedazabemonimofa.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/73841218737.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76bd829a---84569203770.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/4745127072.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/sonatazuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=roblox+promo+codes+august+2020PDF 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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 11292 bytes
SHA-256: c170198bff78c0de73c1b5a931ca7de7c3c4583babc10feb6c204380292c4997
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 17984 bytes
SHA-256: 263354d5650590caad842394a9598e4bba408bc29f8de2f8fe69d3fb4ed1955d
font_02_sfnt_off0001231a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1