Malicious PDF — malware analysis report

Static analysis result for SHA-256 895cda9af6f8b148…

MALICIOUS

PDF

68.2 KB Created: 2021-09-30 22:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 108fa012337ef4ac209e7575b58090c3 SHA-1: 109435a99100d412bfd9c5b2124f981240579a75 SHA-256: 895cda9af6f8b148809a32fa26bb9208d8502687d1fd9a3878829d234b368918
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://good163.cn/Uploadfiles/files/loxanajapotelevasefibuf.pdf In PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/xalegasavarozet.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/76560103691.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109082005173910.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16147c71ea4ba0---rutejarakewotegopif.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/33377711950.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/loxefutamadosageduvixi.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/ribifesuzotibuloxemezopet.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/pobepulufuzo.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/1669968601.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/37284890882.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/futuxifizelepopofebalop.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/125375084aea7aaedc96867a9a767c2c/kakobofa.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/2411606039.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/7625789377.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/lolarenopanafotezun.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/910405fcc6d36da6f02b7162b57f62d6/15963688892.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/tifulitepivabalometamupez.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/welujaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+room+2019+downloadPDF 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_off0000ae0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC626 10664 bytes
SHA-256: a13d938d2f420c09b5632e0f958e2689eaba132b98a759cc25ba9c0c1b9a238b
font_02_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 14668 bytes
SHA-256: c25bf9ead567b4cb424fe03ee0f0f0fda66ec176711b25979af8f388d2667469