Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5227399033ecbf…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 01:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd5ca8172dd6132c8c4638bc4408cfef SHA-1: 8c257ed5852c2120572782621b396ef859b8baaf SHA-256: 2c5227399033ecbfc5a2bfbe9419c5d6732fc0c9135208ae99bd70abebeb7aa7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wheelmartthailand.com/image/upload/File/70574249673.pdf In PDF document text
    • http://piscesappliances.com/userfiles/file/kirumup.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nidijuwolebovulifututav.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/jukot.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6c332bb81b8d133e3f8612274a4a644/88298182818.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/pokibitejolegiw.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/sexavobinizedejufi.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/xurax.pdfIn PDF document text
    • http://lecostationery.com/files/file/29349435965.pdfIn PDF document text
    • https://dellrein.ru/content/file/vebazirojimusinatigifo.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bazuziri.pdfIn PDF document text
    • https://partnermind.cz/images/files/87557095956.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/54178283308.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wagogivivolerinugatitoxo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191422495340.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/7524205938.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/wexixefejerodoronatij.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/netixozumonoguwa.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/3359180036.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f8f6fcae---58739421566.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/71304466580.pdfIn PDF document text
    • https://tivicom.vn/upload/files/bifasawibonaxoxidapo.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/52679332716.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/motozodevazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sams+teach+yourself+c+in+21+days+pdfPDF 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_off0000c0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A2 11348 bytes
SHA-256: f6eab8a38e8b740282a2e79ee2f2622ce0627d946d2796808b0d19e0459f7b35
font_01_sfnt_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 17956 bytes
SHA-256: c47826c1eacff15db8185b68889854f6a64f909edd07635ab78e7f68d0167c33
font_02_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1