Malicious PDF — malware analysis report

Static analysis result for SHA-256 bea3a3be84df4367…

MALICIOUS

PDF

82.3 KB Created: 2021-09-09 19:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 99a1b8326f87da8aa0fa40d63661eb26 SHA-1: 72e20865cf51aa1985e568b53389725143e36e0b SHA-256: bea3a3be84df436700621b3a9a01a57c9af31255d08f0fcdd2f0446f2bc939d7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. 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 heuristic firings point towards exploitation or redirection 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 https://pistant.ru/uplcv?utm_term=halo+3+local+co+op PDF link annotation
    • http://www.mezmat.ru/ckfinder/userfiles/files/68107053916.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109020009084313.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/20808502483.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7ed3daa4---fitatanomudowufetajuk.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/povabode.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/zoguvekesuwewasedojedix.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/pasovinutire.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/62408184199.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/56970332125.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/49864335261.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/vugadafawunon.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/91489108480.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/noledunebozupan.pdfIn PDF document text
    • http://hoachattn.com/image/files/34786838138.pdfIn PDF document text
    • https://swiz.eu/files/editor/newujadibebepukuwumelub.pdfIn PDF document text
    • http://drtamerturan.com/file/97078088370.pdfIn PDF document text
    • http://dejede.com/userfiles/file/xiborifovukedofiw.pdfIn PDF document text
    • http://dominant.name/userfiles/file/wupiba.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wokiwome.pdfIn PDF document text
    • http://cochemical.com/upload/files/14819472305.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/16523342060.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/51902828845.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/lirudijodozexobowoluw.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/xomilij.pdfIn PDF document text
    • 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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 17820 bytes
SHA-256: fe1c0b6ddf1f67826604eb4360cfaa3e0a44e73f9869de311e6fdde2dffd3ce6
font_01_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 9836 bytes
SHA-256: aba2ae4a27453f7ef1c55a9546a0ba2ca73275b755b75391f5c07a4f2b63da09