Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e411528c01e8ce…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 19:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 042f8a20366e58519fb665be49aa3066 SHA-1: 83d05066623ef10f6ad6233883f7a5e777f9eb40 SHA-256: c9e411528c01e8cef25c0f8303d22fe14fec917d192a3d18308583fae5faf14f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded links, many pointing to domains associated with link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

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 https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6ffa0d95---25749187915.pdf In PDF document text
    • http://unicorn-furnitures.com/d/files/nozujabawatikabinibejom.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/kalowaga.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/jidovaxodilojobosaj.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/13662624368.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/76917373880.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/22307546073.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/kejisetasoma.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/98905114797.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/dolamizegeb.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210919233712.pdfIn PDF document text
    • https://onlinendttraining.com/files/visono.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35249908820.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/roliduverixakim.pdfIn PDF document text
    • https://eetravel.net/file/tuxetej.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/88606503002.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/19f48572acad502df00879d00b35019f/tewuzirigitogatanovu.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/15486832516.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/giwivozu.pdfIn PDF document text
    • https://wilde-signs.com/media/72049096209.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/fowegawuwuludiw.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/80576350311.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/xizasoxedegofadunumu.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/wigimoka.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/xadinamujigixal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kumkum+bhagya+7+november+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_off0000b00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00A 10944 bytes
SHA-256: c64f9b83f9de0e61eea494d3eb0fe0c6a96d0e55a604af5409a07ca387225528
font_01_sfnt_off0000c94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94D 15540 bytes
SHA-256: 07d1c7bf47a7192c0dd3cb3ded63db902caf5ebb77485e6bdda5b1c437fd8fac
font_02_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1