Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cc495e859845ce…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 04:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1f2422aad3ef5fda00adf4df77b0389 SHA-1: 3e3af4d7de4e20f5bba971cf490645ad544266b1 SHA-256: 05cc495e859845cefbf74b1b7c6690d0574a6a4a79436ae8e92ce355fe0cc1ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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/suwilidoxamomuxipemozab.pdf In PDF document text
    • http://giasuthienphuc.com/Images_upload/files/gadisovixalufigemawiro.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/bumufesiri.pdfIn PDF document text
    • https://moolans.com/uploads/files/5504012562.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/45808994390.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3089a3db6---27854191321.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/jisipolowaluzixaxerati.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/80381257140.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/fojinuriwi.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/kiborilukevinudinugeroze.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/jovegeperebugasawenoj.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/39020803104.pdfIn PDF document text
    • https://mollis.rs/files/xisevewosifoji.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/72103970290.pdfIn PDF document text
    • http://varvshistoriska.com/file/zemad.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/75222255419.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109191927189048.pdfIn PDF document text
    • http://armanetti.com/images/2566488505.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/pemise.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/78651632361.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/46250880520.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/94303670167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=each+muscle+groupPDF 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_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 16748 bytes
SHA-256: e946018cef1380089a76990b31f3176b13a9b3f1c673d4b03427042905b39389
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F65 10608 bytes
SHA-256: f4db6278edcec6477f5262b14b72ef182b7fdc4268acab3a6928419665b44dca

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