Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf7492c6437abbf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 12:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71f8dd7b8facc92fad6ea61b0a0dd573 SHA-1: 8783d6ca9a750d0883a190e300c8c766d814e215 SHA-256: ecf7492c6437abbf8f98bdb42b88223eabc27844a44e19e12d5372ed7437f276
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://galsabino.it/userfiles/files/88550050110.pdf In PDF document text
    • https://bulendengin.com/upload/ckfinder/files/90136288845.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/12337398427.pdfIn PDF document text
    • http://annabarons.lv/files/files/xodikanaxebuxurifomim.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109090749332635.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e33d14628---84536166002.pdfIn PDF document text
    • https://samudra99.com/contents/files/50703922242.pdfIn PDF document text
    • http://chamdure.com/DATA/files/sunidanibinid.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/35924668151.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/52872147940.pdfIn PDF document text
    • https://stopserv.ru/files/file/rewogorux.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/56300736186.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/11840690530.pdfIn PDF document text
    • http://slsnn.ru/content/file/19345358131.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/boxapa.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/11343389295.pdfIn PDF document text
    • http://hybsch.it/upload/file/4788491332.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/37040483147.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjjumbd6r35t42ts5bs0gvgcvn/73767693137.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/502133814.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/sukobatafonasosotixexigiv.pdfIn PDF document text
    • http://traviet36.com/upload/files/banituwajosojuwasesumo.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dabegisodudujotuluwipuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=update+your+phone+appPDF 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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 10404 bytes
SHA-256: 7e76d78f69c69c984b99c7ed206ff1b64623ae49fe1efc8ca9f3552aa4041b50
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 18368 bytes
SHA-256: ae64c3cb89289235c6006c418d1b0a9eeb52f2c742d7d230456c2d77cf2a894a

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