Malicious PDF — malware analysis report

Static analysis result for SHA-256 81616074e8178c4e…

MALICIOUS

PDF

93.1 KB Created: 2021-09-13 07:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fed322868cef227d545ffe9ba4b3ecc1 SHA-1: 14c243d5325dd6c25dc420783b5fbcae19f183d0 SHA-256: 81616074e8178c4eba38887eac271afb242871c49993340a0c495afc06cf3d73
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm or phishing campaign designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ever0036.com/assets/uploads/ckedit/files/20210905084258.pdf In PDF document text
    • http://royalrep.com/userfiles/files/fofagukiguka.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/tosedemuzeta.pdfIn PDF document text
    • http://didula.ru/img/file/98482176061.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/34797285182.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/jojoxaliweju.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/51115393069.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/sizonaditubazokixixevugaw.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/ruzudatol.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/telidesaki.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/zebonepepevasopazuziguma.pdfIn PDF document text
    • https://luminex.pl/upload/file/53880086634.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f63e190579---vaxamon.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/kodadaniki.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/25922131807.pdfIn PDF document text
    • https://petala.gr/userfiles/file/1921496033.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/91787367322.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/dovesakanasinup.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613907f79ae15---5197090908.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/vudusewu.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/45766338129.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/96440843741.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/51521922467.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/25025625405.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekekanujipanuxunegavisip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=rainbow+car+unturned+idPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 20180 bytes
SHA-256: 9e16e223040dce439b1baebe432de6c66cbb2d6931572d270364c564c4b3b8ca
font_01_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_02_sfnt_off00013617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2E 10520 bytes
SHA-256: f4e9c33ca43541c489959a85d57d0e39d161c979fa37dd4692728f96411a0bc1