Malicious PDF — malware analysis report

Static analysis result for SHA-256 48731e8f88279e30…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 03:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 431a742c990dd1383ef520c7c11a9fe0 SHA-1: 43cea884fee1e62b51f3567cef6628252b0f4d5f SHA-256: 48731e8f88279e30cd2205d478b3a6c44688adc69f9ccbe5841895fa02f16bc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://robbes.nl/media/files/58155922524.pdf In PDF document text
    • http://deauville.ru/files/file/bedudowurasofobebixa.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/9035423783.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/71176943109.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81164886089.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/wodakimogoxotarigawidi.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/bukuzisufatadugax.pdfIn PDF document text
    • https://phunhai.net/upload/files/31440345159.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/jevozoluzep.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3983789512.pdfIn PDF document text
    • https://ksboutlet.com/file/files/gebuxatoxugib.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wisetilexosegagunitotel.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/93200610724.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/tiwizetilira.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeae30f307---65891085623.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/48783622439.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/4806695582.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/59321506485.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_9820E3187FC49886.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/83832822119.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/buruberevokopazakavub.pdfIn PDF document text
    • http://kite-surf.sk/files/30056994995.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/60494159320.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/71161598884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+editor+paid+apkPDF 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_off0000d7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EF 10264 bytes
SHA-256: e921616c2f99472850e829db4cbf20d8acd7e0718037c01ef7a5c924bb20b634
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 18832 bytes
SHA-256: 87f6c1d7294d2b7e8f83d931d88a3db8b4cc263ec0d28bc6b152ff83554d7dd8