Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0ff2397312b94e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 23:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a11a30c13ffaa23a7db781d8a111ae1 SHA-1: d4e7cb016dcf241984df36fa39c4f18094e8ffab SHA-256: 8e0ff2397312b94ef437f4ed1d47b5252c6944895f1586c1fcc7ecdecf460157
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates the document likely employs social engineering to trick the user into executing a command, potentially via a crafted URI. Multiple embedded URLs were found, suggesting a link farm or redirection mechanism to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://imoroz.by/upload/file/taxiwivuwixijevudegimuzej.pdf In PDF document text
    • http://marketypik.pl/zdjecia/fck/file/tiluxosaket.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tuwamanozufagavojatun.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/56971469843.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/38672902568.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c4a0144c9---bugusuvixugatifep.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/46529313733.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/49499262003.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/870e502461625f876acba18c493e5e68/8799547106.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/40268527761.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/7684981784.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/fibotoxubodosiped.pdfIn PDF document text
    • http://mobil-tech.com/files/88095622364.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109032057014396.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/runerisejanaliv.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/33805643197.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/64738577034.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/vitidaxutelo.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/90614696608.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/torapixabutefarikeg.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nileveza.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/wowufudud.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/zixem.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/69128142717.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gewesitajixo.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/73866945037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=where+to+find+bluetooth+files+in+windows+10+laptopPDF 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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 18244 bytes
SHA-256: d1ecafedd25571be3074a8a7fa15e3d05a24360c384b324e7d1a052744a4a46d
font_01_sfnt_off00011cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 11088 bytes
SHA-256: 387c4803189dc467ee175caeb38a13781f86ad9d470879e3c7807bc5f87b2b94