Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc36f1bd319a21af…

MALICIOUS

PDF

73.5 KB Created: 2021-09-27 17:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d5a6bed0eb52692047f1f829fdd0970 SHA-1: ed28c095144ae01004f4f2bf96f1c36fe2a03d8f SHA-256: bc36f1bd319a21afda320a6909b19fe3ab54e63cf8259dc54b389c8482029eb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to external PDF files, many hosted on suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many distinct, low-link-count hosts, suggesting an attempt to obscure the true malicious destination or distribute payloads across many sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://dentherapia.hu/files/file/52135747168.pdf In PDF document text
    • https://incoyun.com/calisma2/files/uploads/11102530156.pdfIn PDF document text
    • http://generaldistco.com/images/file/73159968689.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/96296012365.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161422e3d663f2---luvitibakumoxafanus.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109191907581762.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/30866859357.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/maxabe.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/juderovomalux.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/93321347544.pdfIn PDF document text
    • https://clubon.top/uploads/files/limokaxejora.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/15052038786.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/xozegujoripetazelo.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/pixaluraratorajug.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/33511929493.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/85918543244.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/lapigosonudewerororaz.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vekokowizilepozojeredekes.pdfIn PDF document text
    • http://moneymaker-gold.de/files/bupebevomaxurufoto.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/52186886326.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/kiverawasibavudoxiwigaji.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/98614096652.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/83669538562.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400eb047948---podenamoguk.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/62608449008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+biblia+mysword+para+androidPDF 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_off0000b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 11100 bytes
SHA-256: 02e9ea79218143093192f1bc4f0e007be8f42ef2a892c2cde7b9bc41addd3a43
font_02_sfnt_off0000e97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97D 17772 bytes
SHA-256: de3510bdad6dca1f44235d78ff6656cbf6a1d2200fd0f36d7fa1c79d5bc04dbe