Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88ba1d17f498d7a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 07:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc35c8ae0c117421303c7f100c90b4a3 SHA-1: bfed5208c5d3a2ca28013039427e569bac040aaa SHA-256: d88ba1d17f498d7a9dc168e6f4bbc6b75ca6fca69b9d76fcde0963cb79aedcd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to lure users to phishing sites or download further malware. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pushtypathshala.com/demo/aims/files/images/files/13983214359.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0e30ab196723860f69a9645ebd2be0e6/17609743365.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/46385572739.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/39142862742.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/47823424094.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/gudiw.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109010055178805.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109052146422985.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/74157301467.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/damugagomakulinimanubomex.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/mafapiwixe.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/zabezomesoruvelawu.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/vowejeporasegizejuza.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/92048173978.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lazejiromifi.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/67912370997.pdfIn PDF document text
    • http://metabolit.ru/files/file/sogika.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/xubenotofanop.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/8017801516.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/33247464548.pdfIn PDF document text
    • http://elpijisystem.com/file/gefetotitewetakoso.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/59059255313.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/64856310636.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/31488038945.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/73211332001.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/6009959227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=a+long+walk+to+water+book+read+online+freePDF 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_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 17480 bytes
SHA-256: a6f7a8f408c617cd090148c42f61e1b28fef33e9719af603e26db6c117fd30fb
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 10660 bytes
SHA-256: 539a4f5bc214365fab41443b4abbf38d59d7f5b9fd74d263fece9ebd58a01daf
font_02_sfnt_off000122a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1