Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcd6c5c0c1542f1…

MALICIOUS

PDF

87.5 KB Created: 2021-09-16 14:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86249ab74b3b15244a234d0e25fe7ca9 SHA-1: 310444ee8e5277f60cb1bbe5730551135efd0afd SHA-256: 6fcd6c5c0c1542f19add16ca1b6cd8e69fd4b166299a54debeea7589b5443ef5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

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 https://tempatpasang.com/contents/files/66298421201.pdf In PDF document text
    • http://exmar.it/foto_fck/file/fazuw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84d7ac0de---3135442688.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/99454752266.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/47337508922.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/dupepedobelikisilow.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/92898512117.pdfIn PDF document text
    • https://wsbtitan.com/images/file/85887039015.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/bonisunozijatuga.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109141157192362.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/pozedagugu.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/28681555891.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/44874336613.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/22844959751.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/73338461424.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/41868712812.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b97013bf708c54f23cde0cc53343f608/91693272199.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/24756654680.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/84241809126.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/finodenukovexemovag.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/feteguworunubi.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/negukinobedete.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/64699633320.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/77748142423.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/31837349645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=android+screenshot+security+policyPDF 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_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 18848 bytes
SHA-256: 95c90b835b4e295647af21e980c3ddac87a1cb8d103eaae52f3d0d99fd7e4742
font_01_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13760 10644 bytes
SHA-256: f741bef09ea677a1f2fe31abde5434d595ce7c6b5d220545f8c44466d55eef98