Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96e87937d5a0f77…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 21:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67cc15fe1686dc95763b55b930bf507a SHA-1: 388a35bc31ca4d85422ff056d7b1dce2da7b406a SHA-256: e96e87937d5a0f7731030bb58cd478682b4063b6812c191e3b9efa79cb4215a1
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://taperagi.com/contents/files/jamakodeguvatodobaji.pdf In PDF document text
    • http://eortak.com/img/fck_temp/file/loxifixilurulezodonas.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/25915429113.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/dalotiwipob.pdfIn PDF document text
    • http://atya.eu/files/file/rekitunimagi.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/padepuwider.pdfIn PDF document text
    • http://rentaruedas.com/files/others/47566417432.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/bazowowalujumixe.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/15821701174.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/kitowaletilu.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/semuranun.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/xogefiwadufiredizutajowed.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967bbb7a99---vavipimajudelubenosis.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/sadajanitawarexevorozu.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/84529890925.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/54656192361.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210916/files/20210916222151.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/13717620273.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/mobojonelukapukuvolowu.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/jekatorufulelotisu.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/38462836023.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/wetawanakazi.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/89049398480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=drastic+ds+3dsPDF 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_off0000e7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CC 10132 bytes
SHA-256: ccdb7a2282dd22a09d6d6dafe727c771ac65d6366cafdb3df5f39357c111667b
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 18580 bytes
SHA-256: 8dfed22a41a8c9e28924c3846861386e8c0d20fc18c4ebe5b03b1552836beee3
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1