Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f17d79624ad5c9f…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 23:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 447a6af9a1e948ededb55a2161e2bbce SHA-1: 8a87bcbc4736528c5a1de9d0748336afef95e991 SHA-256: 2f17d79624ad5c9fe382e8311e34fa417cd83b2ad83f7a02371a9b9ded5df400
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://tradeweb.es/userfiles/file/kekepogopuferesepeput.pdf In PDF document text
    • http://tccsrl.org/userfiles/files/dolumatinutuvatesotaji.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/37923418396.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/pomaki.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/51097222525.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/84910361022.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/penujukopetekewoxefedupeb.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/45275054920.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/bobuvuribatelelijuz.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/6597425701.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/pedonuwuzevabopafexilevip.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/bolozewanabitoxerujub.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/wusigofexanefet.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/44059976444.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/11314642530.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/4658806670.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/damonuvepotaronagawimum.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/97758585950.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/14497402541.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/rojeluwipugesevaz.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bscmac528ec4o8rd5o3lb7301k/91057123298.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/gutatonunijegowapuxar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+z+burst+limit+download+for+androidPDF 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_off0000af7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7C 10952 bytes
SHA-256: 1ada5a92ca989a7b235c2e5ee31eb703e71219b334e33caf65f1649cbc174908
font_01_sfnt_off0000c8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B3 16804 bytes
SHA-256: 51a740002e3a54418a505a312971ab6f161dfcaf4fba30285059b26812b3d711
font_02_sfnt_off0000f360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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