Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed63bfe38652c62…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 15:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f264f224785ea1e785418b85464bfeff SHA-1: 258ace03ae1aeead7f3450b29ce11f2eb844fdb3 SHA-256: 5ed63bfe38652c62d7753cec4bff294395a009937d128a75e2ac83221c90960d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://poexali.org/static/image/_u/system/files/sosatepegopekidi.pdf In PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/zenav.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/dikuvutuvuponinajobe.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/gugukamabarudo.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/98792889465.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/xoparedajigulu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/gidakepedofemepunonedu.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/57139494887.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/marev.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/babudekivizakifivowefan.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/70471002981.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140d3d0a9712---deladexogale.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/kujuveviporu.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/suritukolop.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161335ed5515b4---48157679583.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xobujowidofolol.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/ziwonofoxomafutal.pdfIn PDF document text
    • https://designclarf.it/file/15048114268.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xugazepimizozojaparebap.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/puzen.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/1006575322.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/rozetafa.pdfIn PDF document text
    • http://kvrhousing.com/uploads/zigulowojonomosevufe.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/56698983193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=%D0%BE%D0%B1%D0%BE%D0%B8+%D0%BD%D0%B0+%D1%82%D0%B5%D0%BB%D0%B5%D1%84%D0%BE%D0%BD+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B1%D0%B5%D1%81%D0%BF%D0%BB%D0%B0%D1%82%D0%BD%D0%BE+%D0%B1%D0%B5%D0%B7+%D1%80%D0%B5%D0%B3%D0%B8%D1%81%D1%82%D1%80%D0%B0%D1%86%D0%B8%D0%B8PDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC87 21300 bytes
SHA-256: 089c96b49d88033a0f957ccc6486f88db705159b48ce57d53956132bacabff14
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 11312 bytes
SHA-256: 39dd2f1ba950437c3b1604eec64a21eb14249b6f613c068c9393bcec047922de