Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce3d59575694edf…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 22:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a0ff3561ed25e463b83b6194224bb64a SHA-1: 75db69515cbf8da758c385f5dbfb34edc5c9277c SHA-256: 5ce3d59575694edf6a025346d8c60827c13b0d9c59fc526824526e5e32f6328a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various unknown domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that these links are used for malicious purposes, likely to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kanat.com/upload/ckfinder/files/dogibigefojetugag.pdf In PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210901_258898A0A05B2F26.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/jujidozub.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132954f2fa38---lukomotekixepikasowuzol.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109071835208466.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/98875198048.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301254e8ff9---rinugufefofuno.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210906213539_545479582.pdfIn PDF document text
    • http://tianfonmm.com/d/files/11518966519.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/43733492712.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/tesaxurupe.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/40691417840.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/69188053543.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/76650066538.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/59775832145.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zigarosawalet.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/36888144460.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/takeniba.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/wesofixemilokosovo.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/24045600741.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/pojowamapufilapiv.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vefamisudep.pdfIn PDF document text
    • https://oasis-travel.ro/files/fexurexewumiwumana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=starting+strength+pdf+3rd+editionPDF 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 10976 bytes
SHA-256: 9128bffb45f96b7c1af438f95e43e7d8eb555608b9ea11c4e6e605552b6d95e7
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 17440 bytes
SHA-256: d3bfa62f1db15fd29ffc0bb65aa6a1811d4df23d2ae836102fa1691b1d733e83
font_02_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1