Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeeb22211c9d2a6…

MALICIOUS

PDF

90.3 KB Created: 2021-10-24 21:58:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4bc2a7813e8b338cee5b6759c830edee SHA-1: 55b4ddc37a6df1f660f819d700a21bce0cfdcd84 SHA-256: caeeb22211c9d2a6d03d96fc0d20d00e026ccb928b66480bd81459c0308290aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://oniceh.ru/uplcv?utm_term=viva+questions+for+toc PDF link annotation
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/82983159294.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/31624277541.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/wumet.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/sazapuwusagavekusujepuno.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/5713089949.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/48475123252.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/gevoxuxabaxalekozo.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/vizomaxotigomar.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202193125254281.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/50255950526.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16153c8a41e6be---69006997838.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/rawevekivedixok.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/rozejasawopaf.pdfIn PDF document text
    • http://minerva-collection.net/files/files/suxazagesozasufadubegi.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/96809256925.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/bujewoburefezumalere.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/balilawil.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/60398145595.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/wanev.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/12840785797.pdfIn PDF document text
    • https://vimar.ua/userfiles/files/2893609580.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131552839c09---junenezomirotalexomiv.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/55667929902.pdfIn PDF document text
    • https://aurorahoian.com/app/webroot/upload/files/36553829082.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/foxozir.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_off0000f8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 10564 bytes
SHA-256: c0329ffd481db64175e2f5d516c6c36b69cef44ebe1fd3dd0166729195d7209f
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 19224 bytes
SHA-256: c3db94c55189508413219af369fe27af02c781409b0d4aecff954840b58bcba2