Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6e3078fd218cab…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 03:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84de8901d70c32a4dd1712e39a8583bc SHA-1: 966ae9ab451441a81c9db5fa2487e4e922ccf628 SHA-256: bf6e3078fd218cab6b9ce5100561d0bed714c16b1d2edaaab7ec9239852cb563
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to redirect users. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gtselect.fr/ckfinder/userfiles/files/doxakipejefi.pdf In PDF document text
    • http://voijin.com/userfiles/files/18654656565.pdfIn PDF document text
    • http://szm.hu/userfiles/file/34858502539.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/ravakuluwewetatix.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/22271667940.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/metanagitofugovajal.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/7355330036.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/wunasanizakep.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf77c1f47---25324860664.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4dcbe01c1ee3b47b656cbbf52abc95bb/15488753873.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/lojetuwagedipig.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/fixurawapa.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/furizuximigimifaju.pdfIn PDF document text
    • https://photojet.net/userfiles/file/17566960995.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tirefogewumogusinapoloba.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/muvodumabafatefus.pdfIn PDF document text
    • http://stroi-sistema.ru/img/43408375957.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/josovetedinemewuke.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/rinumupazerasijuv.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/65842803056.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bipezoxoxujulusedinapuduf.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/78328762829.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/rutoregeguwojuz.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/dizavazupawokebaj.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/75310444812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indian+bus+simulator+downloadPDF 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_off0000d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD318 10556 bytes
SHA-256: 56b78fe19b6f03f146fdcffd6aa340a61a3cd1581549c18161aaa34822bbeaba
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 17488 bytes
SHA-256: d8543cfc48e0caecc2b365469af56b95944afffc8cb3e2a2625128f34603eaee
font_02_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1