Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c9868863b10d5c…

MALICIOUS

PDF

88.7 KB Created: 2021-10-05 11:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e4097fbe2420ac025aa6a3016d37ba38 SHA-1: 2209a5166317d3c89191bdd0b4d9d2a44d6315d9 SHA-256: e9c9868863b10d5cec754d9fd11b544081667b48d87ba3359be073414c5bd488
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://vitalchurchesinstitute.com/files/file/topagofogag.pdf In PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/31985193240.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/sobuj.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/bovoruzotorimavazunaf.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/27659482700.pdfIn PDF document text
    • https://emenu.hu/editor_up/17806955619.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/binosaxenemodavirajelena.pdfIn PDF document text
    • http://tochuchoinghi.org/files/42798183962.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/24620310522.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/12741949039.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/dogapejukubalomemop.pdfIn PDF document text
    • https://socardan.com/userfiles/files/wutebewefuj.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/76005544078.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-10-05/ffd4f3d2d62f1ea635e27b7588b11847.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/34963490279.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/osjopkf7gspl12q4tqjfdghj2c/75161859156.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/tofekamalonepitam.pdfIn PDF document text
    • http://ativn.com/upload/file/dopizafiwatilisivavuziw.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/nirujowiloregapifo.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7061488682.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/kodevipikijazajakujot.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/ditob.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7f916203---kamozuwurafebajasovirazed.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/gunive.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+answer+what+do+you+like+least+about+your+jobPDF 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_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 11000 bytes
SHA-256: b5d934052b4e492fa2d4b2670de607c64c4ff6ed3afe6109b9349789a2459340
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 20352 bytes
SHA-256: c0bb8cbf17fcbbe986738193febc72a367a65dc46f923fd1ce73bbeb4e16a9b7
font_02_sfnt_off00013cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1