Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5381585ee25c0e9…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 11:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6a8e1f887c20c0384c848810742b4123 SHA-1: d0b9b05b98e246bc7397e63e3c24b526e68f38a2 SHA-256: b5381585ee25c0e99b79723b713ce889e3678a80800d64d7249d36da08b2ad59
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and a click-outward action, typical of screenshot lures. It contains numerous links to potentially malicious PDF files hosted on various domains, suggesting a link farm designed to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://jmyhship.com/uploadfile/files/mejidatodepujifopojitil.pdf In PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/pebuwusogufetunalotexif.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/tavejupodarovu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/54656d8f04f1985c9e14d9df6fcda379/tikewusifetasabagikorozu.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41238971254.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/miloperixiduvojot.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/ridamigotimevorutuxuwes.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/zoxajazudovufowinusedavul.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/fujazokagipu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/pobexizusuvanexiseve.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/xumemi.pdfIn PDF document text
    • http://hidramaco.com/files/files/mokejatoviduzigaguzen.pdfIn PDF document text
    • http://nanopena.cz/upload/file/roxisaw.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/48476387467.pdfIn PDF document text
    • https://rodotour.com/userfiles/file/5819020280.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/jejuvepirabodewimofizemid.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lozegese.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/77166223724.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/14a18dcfbfeef5cedf312aabcca989e0/joxazaxixana.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/14685774753.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/siwinujasurupevegu.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/94632856965.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/35995376399.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/bibekulemugogerevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=alive+2020+full+movie+english+subtitlesPDF 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_off0000afc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC6 13968 bytes
SHA-256: 6d48fc0446094c41080a6f5f2fc3660197273ab79b643924088ec9de787fedcc
font_01_sfnt_off0000d266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD266 10928 bytes
SHA-256: b72a6226a494f37306abe91fdd7ea27c318ff278ae0b90a78167c9bf59b9c025
font_02_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1