Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52451d2a5e1f6d2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-11 03:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 70524067ce0f707aa984c0a4f5d30fd6 SHA-1: b70ebea2fe892cd82dd723b427c8c73230232e81 SHA-256: b52451d2a5e1f6d2ec72106be464d980358ce5e7f07d3a7335d29172956baa35
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ClamAV heuristic specifically flags it as 'Pdf.Phishing.Trojan', indicating malicious intent. The presence of external URIs and the link farm heuristic further support a phishing or malicious download lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1739

Heuristics 4

  • 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
  • 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://smidgel.ru/uplcv?utm_term=windows+10+enterprise+update PDF link annotation
    • http://dominoliberec.eu/images/file/files/99504601367.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/64707310692.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/77947393429.pdfIn PDF document text
    • http://elsped.hu/files/file/xiloramuzowavinetow.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/nudovazikazufazoperuwava.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901182435_drv4bz.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83923056648.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/73046249777.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/nateveva.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/lobivumawedu.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/vajewenanidibarot.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/derumodakopidabonudix.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/mitorukiwibunitigewapu.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/9885657230.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/49864865486.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/sagejefofafotokobe.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/52245674819.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zozawojovixenozagidorepa.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/xizixevovivekeloti.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/68935068358.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc9c23191---42792985007.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/83442008448.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/libixikewubilejewef.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/bozakurefakafogexolasol.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xexivegob.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/5599474003.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12960 10692 bytes
SHA-256: 61aa8514ad38deb771343e023b366596a39a0f3e8421921958b977bd76f3908a