Malicious PDF — malware analysis report

Static analysis result for SHA-256 6187e0edca3953ec…

MALICIOUS

PDF

90.0 KB Created: 2021-09-11 15:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: bc41de806fa6a1ebb0fa95d8d4a715a4 SHA-1: 27eeb83f6568aeb4a09afb5c2cde8b1c4b00b780 SHA-256: 6187e0edca3953ecdefd17fdd75928b05b8b3ffcf9ad6ec9c5a7cf68ac5561ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or to distribute further payloads. The sample's structure and URL patterns suggest a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://khocabien.com/uploads/files/luvulejipadezaxinezuf.pdf In PDF document text
    • https://morethancars.eu/uploads/edytor/file/bonanewagiruvawovolitew.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/2163401160.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/31490669077.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/30934030583.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/zopik.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f638f572e0---85432774600.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/tevubejufonugixiw.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/19096091873.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/96834586282.pdfIn PDF document text
    • https://namphuctourist.com/userfiles/file/19635545723.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/daboxeditenep.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/5290049626.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/fiwexogefidutu.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/zujubidinobulugemodekupu.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/jumolilodamin.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kifuvabiganisakakuros.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/zelan.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/gufodexudunuluj.pdfIn PDF document text
    • http://bdsductri.com/upload/files/7444114008.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/57023239050.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/31830827042.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/99904083109.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1d370abfba505fdd9a743b71df0999a4/76187298067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+tale+of+benjamin+bunny+class+3+questions+and+answersPDF 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_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 18680 bytes
SHA-256: 3f80cbef1547bd5474ad328641882a0eed899fc21e9c16874bf097b5ca5c4a26
font_01_sfnt_off0001272c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272C 11592 bytes
SHA-256: 6b2149ee6f23f5f1b02ddceb085b3528c0fd6acd564d503c1da08557efd35b77
font_02_sfnt_off00014264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1