Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52eceaa5a774d87…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 20:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccd8040be29959fb795c9c26481b7d54 SHA-1: 3287161d5962cc2da4b44455c477e88a6ab5061d SHA-256: e52eceaa5a774d87d965a759dd874b9f29b199127cabf957c4778b2d63a6c505
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various PDF files hosted on disposable domains, likely as part of a phishing or malware distribution scheme. The presence of urgency lures further supports this, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=font+creator+apk PDF link annotation
    • http://nwatchonline.net/userfiles/file/fatawuzevoripadinobuje.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/biwasumujowizironuka.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/76711234618.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/8360711929.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/71726040100.pdfIn PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/27301534545.pdfIn PDF document text
    • http://malifer.hu/upload/file/pitubikokixupedu.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/sekufulotijupopusewetaz.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fubemi.pdfIn PDF document text
    • https://jobtiara.com/files/files/18984198465.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/88128635773.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/32003016959.pdfIn PDF document text
    • https://mimpidia.com/contents/files/gibutolupe.pdfIn PDF document text
    • http://moneymaker-gold.de/files/9954244640.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/97511949690.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/65111321938.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/pibosumowolibu.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e3d2fc90e3cad25f42b09305c109f7f1/97472421035.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeb192df5---51504835879.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/53612268842.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/38183744711.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/bewagezotinoxutebojirijup.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109050731214383.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/dugowajazipumiz.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/82526834355.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87007412907.pdfIn PDF document text
    • 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_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10713 18976 bytes
SHA-256: f47b051b3127b918042cecd2b20bbc304945f4f710abaf96fb2eee83e5e00c6a
font_02_sfnt_off0001382b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382B 10132 bytes
SHA-256: 4e6db621b172567c64e711e94a6212be17605175a2b58d81de28832197e1bbfa