Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdc6476e18b9d3b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d03aa41d7e72a76e95288f4becfbe9c0 SHA-1: afbf533ea44cc85e44db70dc71a428a6800f7723 SHA-256: ccdc6476e18b9d3b0515dd11e217a4ddeaa7b2e823cf36c1d07fac3263ff4585
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=sd+card+not+visible+android PDF link annotation
    • https://nacituran.com/userfiles/file/jowisotojuvimam.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kebutigebulewijukopeximi.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/sirumaxali.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf36c4a43e---sovitunemawevet.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/33423345272.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/wuwozidakideboja.pdfIn PDF document text
    • http://bluebossa.pl/files/file/87559841939.pdfIn PDF document text
    • https://kuepancong.com/contents/files/36267064943.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/b9kaqnpmb26osd6d6hjj8b2heo/bukat.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/nusinabitojajap.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/ronatawoxavorirebudufiro.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-10/20210910220252404020.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/76944765638.pdfIn PDF document text
    • http://eva.am/files/9b6c3c69d93efc7f.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/49554289213.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/kenosowakibinolevavekam.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/28021358502.pdfIn PDF document text
    • http://koddous.com/userfiles/file/54857693285.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/salamipasijibemo.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/domitixegiwone.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210925154833.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/9585774064.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lumoxekakudokix.pdfIn PDF document text
    • https://cian.hr/userfiles/file/rofuledixorokirasor.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/jijadabisev.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/33247616813.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_off0000b2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F4 10644 bytes
SHA-256: 7a322e9d6264ab70c576820199193df195fb6e9aac0c7124dca436dfe854701a
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 17660 bytes
SHA-256: d25506ead08380a428458933f56438786b64fc5ddd0b1622a9eba121ded84f6d
font_02_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1