Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed2076838807f4f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-30 11:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45d84c6859cb8214f3acd3fb5c9ec089 SHA-1: f918c1f4793f76ec6732e05db1a5e165f3041782 SHA-256: bed2076838807f4fd45c7c4ad5ae8812415a49acd3d962a8fda3b3b4413db6b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting and redirectors, suggesting an attempt to obscure the ultimate destination or evade detection. The presence of multiple unknown URLs suggests a distribution network for potentially malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3855

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/mojegegumobudorefejinu.pdf In PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/95230283564.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614071bb79c04---57880661171.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/jonevaxepafokubuma.pdfIn PDF document text
    • https://kimcert.net/E/file/nemofopek.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/46737179737.pdfIn PDF document text
    • https://basisnomor.com/contents/files/31214974308.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/voturovogavevefo.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/navamujimuvifowonoxuvojuj.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nitedarokivebufifowa.pdfIn PDF document text
    • http://nktrading.qa/file/files/sowedorobavanutevawufebe.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/11/21980343990.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/86544617132.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/29631702943.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/46931278052.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/woxota.pdfIn PDF document text
    • https://heyratacademy.ir/file/wazozobokedufano.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/xoduxegonulufo.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/9512539643.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/mijaboguzat.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/nonovoxus.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/55146481675.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/12989411556.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/74427144408.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/xuromomemif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ielts+foundation+pdf+free+downloadPDF link annotation
    • 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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3A 10628 bytes
SHA-256: a725ef4750ab10d750e488182a8bde5a0640c0859a6acb60654f4040479eeb9c
font_02_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 18224 bytes
SHA-256: 84330b47a66afaea9b6c304563295d63aae22a84842990fa59a85f78f9651bae

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