Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc91b449bf1bdf2…

MALICIOUS

PDF

67.8 KB Created: 2021-09-27 01:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f7f84e705c7f2f92b68f9d195a872e2 SHA-1: 69877516abdbd0133a4638a8bd18f2d12ae621ba SHA-256: ccc91b449bf1bdf2c9dd0754047524ee1cc24b7db1e6b7f389f7653a4ac36e0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful websites. The presence of external URIs and the link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=vidman+app+for+windows PDF link annotation
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/rupamobaxezowe.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/wuzogo.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/60472016808.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/baqrcg0vf2eo50arms28eafaf2/xogefekiwu.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/16014140148.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/12908973500.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/favir.pdfIn PDF document text
    • http://domario.ru/userfiles/file/wonitinalumirosakusiba.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/48400507172.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/28766886713.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/zisunisirekavafo.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/52183669135.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/fufisoxopowefelol.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/25927633038.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/24470475556.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/lepuj.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210902_6C98065D7E2E4300.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/49842693309.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///202197347206547.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/nedegadedakuz.pdfIn PDF document text
    • http://shamayachts.com/upload/file/72890531556.pdfIn PDF document text
    • 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_off0000abba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABBA 10440 bytes
SHA-256: 88b1deaf0fbff1d55ee76ba993f890bb1a3f03a2841d3eb9f8e21703d7a37bfc
font_01_sfnt_off0000c35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35B 15236 bytes
SHA-256: 37103e3f67be9bc537a0478e27ccc3a1dc0fc785f8e0258854779cf193b0d860
font_02_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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