Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8015265f1c903f…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 21:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ddbd6092aac46215f478c188df05ce41 SHA-1: 071df2dc2bfc9b7999ba8ea53c97629d751cc104 SHA-256: 4a8015265f1c903f57321ceda7e2d475064d12d32750c36a67aa3cd567276a2e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent, classifying this PDF as a phishing or trojan delivery mechanism. The presence of numerous embedded URLs, many pointing to suspicious domains or file-hosting locations, suggests an attempt to redirect users to malicious content or download further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common phishing or malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://artstudiodesign.it/userfiles/files/30133015698.pdf In PDF document text
    • https://unifor975.ca/userfiles/file/xuzif.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161585026484a0---53390435613.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/putemisolaxeliwigoxo.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/satojuwinuxax.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/xagowufijalewab.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/dinokijinepatijefu.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/fakeva.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/xoramabunuzosevumowo.pdfIn PDF document text
    • http://getvisa.ru/images/File/83947788526.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/57292951017.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/7520943681.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/gadexasudol.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/86938679969.pdfIn PDF document text
    • http://forti.in/userfiles/file/27966547862.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/37767632680.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109170150277281.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xuramona.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/wofixapiferelez.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7e76cd273---39799543348.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/giwijavewina.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/tajekubobow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=seeds+of+orchids+are+endospermicPDF 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_off0000af48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF48 10816 bytes
SHA-256: 68adcdf89be86f47d415b942db74325ebb140c0196c1f4ee63dd36bef5eeb34c
font_01_sfnt_off0000c7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F2 16012 bytes
SHA-256: a56513f3c7675cdac66177bbd96a1867aa231e1851d7a895ce9db55a3036c84e
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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