Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc21aa28a0f164b5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 04:19:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89b74e7f686d4b91efe788d474c5f9b8 SHA-1: 704383c8bf8b903cd3033e32ef70a4b9bb532b65 SHA-256: bc21aa28a0f164b5784762ceb9b51b0484809e73d63a555c4d2965bb70424750
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a link farm with numerous distinct hosts, many of which host PDF files, suggests a phishing or malware distribution scheme. The embedded URLs, particularly the one pointing to '3mfa.com', are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://3mfa.com/images/editor/files/lunegim.pdf In PDF document text
    • https://pasarantogel.com/contents/files/23353565862.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/liwitevopiderizidosuzi.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/6956558442.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/98282572323.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/29626939357.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/20442997586.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/33923321218.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/livusawatomo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/13640726142.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/waxag.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161409df80cd28---fazoteketozutivasadej.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afba32fc8---84466763937.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/86519339681.pdfIn PDF document text
    • https://cargotavio.ru/files/file/99382472567.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/5932028342.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/weguwikikokojala.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/77112459695.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/23739389096.pdfIn PDF document text
    • http://freeorden.com/media/file/73300033747.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613099e216cf2---neluwepu.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/xijesogofuvukarejefamuso.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/54274567724.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/mepokamoze.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/18222289422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gta+5+obb+file+download+offlinePDF 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_off0000b0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 15672 bytes
SHA-256: d990292d6634d90da8426a08cae116f40eb3c91330ebab5e9babd4af84c60b61
font_02_sfnt_off0000f07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07E 10476 bytes
SHA-256: cc70287c736f8db6c8d8a3f5e18525edc071ed3b149e117032a93b57d82b83f5