Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f069d3b03825e83…

MALICIOUS

PDF

93.2 KB Created: 2021-09-21 11:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 886434ad7f25da78240440cd1c22d0d9 SHA-1: f9c145bf62a2f6ca98c72332a1d431a6255afd9e SHA-256: 4f069d3b03825e83b274470c487db543c2d7f5d98fcc6a85b69c02adf048c99f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many hosted on disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://pistant.ru/uplcv?utm_term=debug+mode+android+studio PDF link annotation
    • http://giasuthanhdat.vn/Images_upload/files/92220885849.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e944ceb6bc---91227437667.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/vulubetuwikitaseforuralu.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/tafile.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/gejuxirepuzemogunewe.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/80637536098.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/11704998263.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/repur.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/gipepugusugonuwufobor.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210917_21AAA349F097ADBE.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/42583942434.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/22682556105.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/kilofinefigefojimofufug.pdfIn PDF document text
    • http://dalaichau.com/files/28310091398.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142234f4ab2d---jutuzukupimajanojujiz.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/68047591941.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///baboxegefumumopedar.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161324567bb58a---kokaw.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/wilebenumuj.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/bagidikubovogawedago.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/10468910411.pdfIn PDF document text
    • http://secretinvitation.net/images/files/bevesujevenagugodobotivi.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/miwakonimatojuwofazubol.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/82561670152.pdfIn PDF document text
    • https://777mto.com/contents/files/81172993128.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_off00010781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 10788 bytes
SHA-256: 3356f72cd14a8c61d8321c72d6a48b5bf04b5d02759bf05db45f0bee974aa145
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 17960 bytes
SHA-256: 54356fe9b68a79f50a8dd2b3a83a635c04943f2b9b42be670a5fa8ded4eaf547
font_02_sfnt_off00014f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1