Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa62491c74b2b0d1…

MALICIOUS

PDF

87.3 KB Created: 2021-10-07 20:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1fbf82c743e86858bcbc48a210147f84 SHA-1: 6b6fd342b38b94d43b252c47fe0b3b19b2352d66 SHA-256: fa62491c74b2b0d16045654db861d9eb7f0a6728d7491378f454f663f49ad7bb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristic analysis identified numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body is unreadable, but the presence of many links and the malware detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://indianspringhomes.com/userfiles/files/xejur.pdf In PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab01bb8741---nibunesosesizet.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/40710515333.pdfIn PDF document text
    • http://freeski.hu/freeski/file/67233391508.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/ziniwajivabovelideronana.pdfIn PDF document text
    • http://dip.natura2000.pl/imgturysta/files/misilaworexexefezemuk.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/luzutilisedufivowor.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/geboramip.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/77550973641.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/23147863685.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/mujogeli.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_87B4F314EB69C020.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/fimonopokekozebuxejunoda.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/vawuvisawusataxelas.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/fanopupu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f945b3a1bdfc96f119157db940259437/gegidow.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nujurovi.pdfIn PDF document text
    • https://moolans.com/uploads/files/40820100353.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/gofufoponopiza.pdfIn PDF document text
    • http://camonetinternational.com/files/file/75430196710.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/xokuliwer.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/79581100798.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/futupopatomuxirawitil.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210929_EB4997048B69B46C.pdfIn PDF document text
    • https://redac.ch/upload/37395478581.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/wadilixetebusutidoseloji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=crop+picture+into+shape+onlinePDF 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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C7 10604 bytes
SHA-256: 5e9550d551ab4dad5f7128e72ff3380d41c915d87cb579ac31c349ccc90a4646
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 18720 bytes
SHA-256: b807df56d3480ab878139e9dedc753d02e5f527efd55e6857b20ec8e466f7846