Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70ced4671ce6d27…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 13:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 189509f1f4aab5b35985181e74e4ab71 SHA-1: 8e4d8988ae8549bc8502ba6a2aca65089cf32d80 SHA-256: b70ced4671ce6d27c94fb5f5a82ac5e39357b5ebbc44e0c92528df94653a3249
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to redirect users to a network of links, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ans5680.preneed91.com/upload/files/70016271699.pdf In PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/33930690759.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/xuviwudijifuxulu.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/84253355172.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/litumesaropuze.pdfIn PDF document text
    • http://technocom.pl/editor/file/40257070820.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/kutisasazub.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/44008774214.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/56642143861.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/20153564641.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454578e9dba---tunivuxetegewuz.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/71586135537.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/gurunag.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/50334622546.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tikiru.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/feditonusux.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/sixejesosadajodu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614443041d2a8---mineweva.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/pukugusadoviberimopekip.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/80581319612.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/24263717562.pdfIn PDF document text
    • https://il-gusto.com/images/file/81244038649.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=human+fall+flat+apk+free+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56B 22316 bytes
SHA-256: c5f31fb875f9da7f2b217e5c52dcaed7215bbbb4a988fd8526ed4a16e1772c8c
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 10672 bytes
SHA-256: 548e7651bb55f379b75c1ec134b7d7e7cc5e60a71112cf583277cc313a781941
font_02_sfnt_off00010549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10549 16696 bytes
SHA-256: 6ad88bfe0401f32c0b1fc38a5fedff9554cb84cd76393f6e55fcef014ef0edfc
font_03_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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