Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52e8bb434acc642…

MALICIOUS

PDF

79.0 KB Created: 2021-09-08 17:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b9f203b4560a81b38773b9bf862ff795 SHA-1: 51b96403ef4f2807f12c9fbdeb90e3dced45e4e7 SHA-256: f52e8bb434acc642ec30a279963f9da78b37963b46698d4b293ece511c2e24a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The PDF's structure and the presence of embedded links suggest an attempt to exploit users through deceptive content, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bedandbreakfastholten.nl/userfiles/file/82621447060.pdf In PDF document text
    • http://zhxndl.com/uploadfiles/files/sanabotunagegijawenimag.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/werinagabovisutiza.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/75549785718.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/46322023086.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/kurufuki.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/dubovaveb.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/24034242232.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9f9bcc0d---misaberebabusobonexe.pdfIn PDF document text
    • https://olterus.org/contents/files/jonaruparaxove.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631013623.pdfIn PDF document text
    • http://yoron.net/up/files/debezowotawepivele.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/5227257338.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/pezefene.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/84541456994.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/nugopafogokujadifeporekiv.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/sozokapivitanosuxuke.pdfIn PDF document text
    • http://intertravel.hu/_user/file/72916770847.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84958586372.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/loxizuga.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/bobanusipelizidova.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/7978316417.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/xemowofewoveliledud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=parts+of+the+body+worksheet+for+kindergartenPDF 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_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 11020 bytes
SHA-256: 491b807bbb4ca471e615d06da18b89ed0e73152eaebb4a1ee55f8c807e286ae9
font_01_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 17416 bytes
SHA-256: 12942d84f468f94116c8494f156f64738e24abbb3b0ce30fb2c27d4c175395e0
font_02_sfnt_off000115f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1