Malicious PDF — malware analysis report

Static analysis result for SHA-256 4673b2848371d7f0…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 20:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61f2967c7abf8c81e2a25bad7ff14e30 SHA-1: 5d20a156a9ae60151bb7abf6b03de84140317330 SHA-256: 4673b2848371d7f06613ef78dbc103539703dcca11b13f2d490299e250a81367
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to potentially disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://onecre.com/images/content/files/16619874038.pdf In PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/rabotubasawagoxekus.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/paxuliguzexokupejotuwerof.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/2942429915.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/gumetowiwadozibuguwiga.pdfIn PDF document text
    • https://kor.mycultureis.com/FileData/ckfinder/files/20210926_66E62F2F4A3F2CF8.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/4360246643.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/68115280710.pdfIn PDF document text
    • https://curvy.tw/upload/files/nukukajetujorivoref.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/84368794674.pdfIn PDF document text
    • https://rm-parketi.si/uploads/kidotusabemerow.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/72082548596.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161503ed24e578---46937553355.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/kamezexokopuvufalawe.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/35892093775.pdfIn PDF document text
    • http://mq-water.net/upload/xizazizosu.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614120add7b64---63562797635.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/dezirizumezedovazenipemap.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/91295460207.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zififilewumelusukaf.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/87933292781.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/gibibisufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=multiplayer+games+on+play+storePDF 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_off0000b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 14892 bytes
SHA-256: 985729d1e197cb475faf809cdba71e743014e0df32d295775aaf2f8a4e43eab9
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 10800 bytes
SHA-256: 5691b90bcff789448df357baf6564c4c32a1e853466446fd568c6de2cfda353b
font_02_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1