Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4786c11ba0b6e…

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 01:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45c2d7535bb949979318e7f6a67a43df SHA-1: 92ad8806886e9f9196ebd03c39b18ce94978ab79 SHA-256: edb4786c11ba0b6e0ea315560c6a05722fdfc6b00276101cd0e4fd6527aedb89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing or malware distribution campaigns, often initiated via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://vietdubai.com/userfiles/file/gilarifujugapeg.pdf In PDF document text
    • http://laibros.com/ckeditor/userfiles/files/fiwigabiletuderiwud.pdfIn PDF document text
    • http://lulanjina.net/upload/files/neruxow.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/62189819447.pdfIn PDF document text
    • http://abwva.com/uploads/files/dakatuwume.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/bolajokex.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mawenigi.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907131124.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/98064335255.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/kutuzaraxiributuwazoxab.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/48239354086.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/fijifizebujejokokusuki.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/tamadilenijiza.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/46169575459.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/kodidiv.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b660c01dc14fcc8ca350397407010b3c/mutovowovepezi.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nubikajibosi.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/66936246860.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631150009_cbea969507.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/widafezipogesusejij.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090116093184.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/gigox.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/14742502388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=iphone+6+plus+2gb+ram+price+in+bangladeshPDF 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_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 11340 bytes
SHA-256: cf5260196045adc55207f819f8433afc2bb9c57176fa5d5a01138ac5b83ea289
font_01_sfnt_off00011362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 19524 bytes
SHA-256: b8156be51f82e6f1c2e5c09119525dac11844e8d0ff6475bb7d912d3b79b8644

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