Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f61333649f3a8e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 07:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ddfc9b48f487b12db9ea92b230b3192 SHA-1: 200704ed5459caa3c05f471774fc023171ed3faa SHA-256: c2f61333649f3a8e7a6ca49f1616477ff1210b93738b319679075ad0abd66fd7
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic flags it as a link farm on disposable hosting. While no scripts were extracted, the presence of multiple external links suggests the document's primary purpose is to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sictombbi.fr/ckfinder/userfiles/files/norisixopufada.pdf In PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/82468099176.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/jexufuzaxezovopad.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/sujoto.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/68544985159.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109032312331545.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/94962219685.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/82404129723.pdfIn PDF document text
    • https://angkalaris.com/contents/files/fofebupifojuluvupuxoro.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/51653732109.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/gifiwikaxavibojusakurade.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/posisupifefu.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/seteg.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/13628987342.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/30699544699.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/gofaxu.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55874592162.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/wawomupuserepemolumiv.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/8332817833.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/36923356145.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/zazobisedi.pdfIn PDF document text
    • http://scpt.it/userfiles/files/kefuwaxenujak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abd5a479b---zopovujuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=characteristics+of+cost+leadership+strategyPDF 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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 15912 bytes
SHA-256: e446d3d8a9516686bea9e5fd726f8842ddddbba2612e2abf3b2378ac4f48c6aa
font_01_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 10940 bytes
SHA-256: becef2f44998b1448e624bbe762c8db638c211cc87ab614c0c5edd12b1a95208