Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fb1615e1b6daaf…

MALICIOUS

PDF

83.8 KB Created: 2021-10-11 01:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53428eec408709f1fcca8cfe658932fe SHA-1: fc886b5d7f427433f5bf3b36a1875fe08bbfc885 SHA-256: 40fb1615e1b6daafe07efb3749a42b4fd2b0a2654756addfa85155ae9c1375a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and forming a link farm. Heuristics indicate this is a non-clustered link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as highly malicious. While no scripts were explicitly extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.gryf-wet.pl/ckfinder/userfiles/files/rogixasazuzexuju.pdf In PDF document text
    • https://laplacedesstores.com/upload/file/14685349246.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/18368468119.pdfIn PDF document text
    • http://1careglobal.com/upload/files/9734237792.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210916_180717.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/31760901854.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/punomakusunuvegutabog.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/20508932771.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/xawutavoki.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/16474256475.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/wogarurexiz.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/dajilez.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/12935704896.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/kajefid.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/naximu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615813b24ac06---begekodexen.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/bexaxeleroxojaporapiwafi.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/22922813688.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/70290332889.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/jemavawuxelu.pdfIn PDF document text
    • https://bunianco.com/other_files/File/masebu.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/wivexetulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cost+to+hang+and+finish+drywall+per+sheetPDF 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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 11008 bytes
SHA-256: ea469a03af08ff3388daca49340524541cb9297b66ffa3c4e09e7ccab59bc34b
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 18288 bytes
SHA-256: d72057c7f996f82e274811e862cf856aa06c308bab71339638253335928c9823
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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