Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4cb226b7b79d30…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 15:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 386c7f57c00b001ad671f3d94888bd1b SHA-1: dba9558c91d31b40a25de500045131d749f5888f SHA-256: bd4cb226b7b79d3097909eb27c41bea6cdb49069844a9f565d95e414fdce26fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm with many external links, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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 http://wuchem.com/upload/files/gudezawis.pdf In PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/gufuni.pdfIn PDF document text
    • https://durimawar.com/contents/files/60953232712.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/38330574199.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/sinevinoze.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wezigarimutesata.pdfIn PDF document text
    • https://wrd13.com/force/file/61313336199.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/85874887875.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/datunowibinadenenigomowa.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/memono.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/p9ogqvht8kj1dmru4jfhtpea7p/zetibazumogaritet.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329fec1bd45---kibejap.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/bulukubesuxowululop.pdfIn PDF document text
    • https://paradigma.bg/uf/file/10396602730.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/femupomutegorun.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/wutexuxuxisedejagij.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/16048850450.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/fawegekigoguxenexama.pdfIn PDF document text
    • https://windscrm.net/files/file/xeruvulijamadejej.pdfIn PDF document text
    • http://snft.ro/media/file/26155463214.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/migubarorizidu.pdfIn PDF document text
    • http://esejsc.com/upload/files/41806618123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=igun+mod+apkPDF 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_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16544 bytes
SHA-256: fee4b795cf236dfb265e8e87c3c8feebd657fc3a552e9e6e726e5759239d4e17
font_01_sfnt_off0000fcd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD4 10244 bytes
SHA-256: 881229b06be96a71ee94baea4e693c710f48adcacfebe17612fecb8194be7bd9
font_02_sfnt_off0001138b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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