Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74c57ba0fa9dcbc…

MALICIOUS

PDF

80.8 KB Created: 2021-09-14 14:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98aeafafed2a647b1d9d291e95850cf1 SHA-1: f82012384ae6b13e124492c8e686ebee25baa989 SHA-256: a74c57ba0fa9dcbcc8e6c36a640528fbfb3e2e84fa7b95a814a20bd679f52d31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to other PDF files hosted on various websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests these URLs are part of a link farm designed to obscure the true malicious destination. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure to download further malicious content.

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 https://huntic.ru/uplcv?utm_term=tim+winton+the+turning+pdf PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d019af2b48---moseniwumujo.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/tiwiremubevib.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/73224017555.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/wotigin.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/23716632797.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/99996744872.pdfIn PDF document text
    • http://kaies.net/upfiles/file/96852356269.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/94358491435.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/68682961827.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/24636216500.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/77054051592.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/narupugulisiv.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/vekobomuwodobolozeg.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/54091918714.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xemewofiraruposugaviled.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/58297084224.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908051024_me3its.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/027dc6d693bfff49721225802f86ff44/86101841956.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/roraneroziputopawuti.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/tolibafazikem.pdfIn PDF document text
    • http://askaudit.ru/price/dufulag.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/xefez.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/putivuv.pdfIn PDF document text
    • 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_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 10716 bytes
SHA-256: d8502e9fa38eefe2f1d64c1ff7af322d8c5f9d50954ae3d39b7ef20eb1805187
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 17468 bytes
SHA-256: 0f7ac0962c0b53f8805872832c712c985473e34e3cca7ebd731c79d8ebdb3cce
font_02_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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