Malicious PDF — malware analysis report

Static analysis result for SHA-256 e791179f4173b91d…

MALICIOUS

PDF

85.1 KB Created: 2021-10-18 03:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 30eb84dc38876ce0297e93809905dcf4 SHA-1: 74a1dc2427d75d9bb90b2f500b88f988fa866f0a SHA-256: e791179f4173b91d22de0d290b1f9fd0c76598d40e65459af7dd8c13a4892424
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://indago-rovigo.it/userfiles/files/66248341012.pdf In PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/gefamifineg.pdfIn PDF document text
    • https://xaydungkienthiet.com/upload/files/52202868079.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/43432158449.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/97006829816.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/vikogufawomawutufe.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/gipofefev.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/54734855733.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/72396573102.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1615ab2f7dabf3---636272477.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kositopodipogolejenog.pdfIn PDF document text
    • http://ladna.pl/user_images/file/guzatitibupalekovuneb.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/wanodikuzukufiwadamufa.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/34204380279.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/92202161466.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/kepilegopokupejavurasupaf.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/83375007374.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/divalemawaxopepafozuk.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/doburazewosixajade.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/neseselajin.pdfIn PDF document text
    • https://forssh.com/userfiles/file/3184402986.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/Z3ufxtS7Wvw/uplcv?utm_term=us+history+from+ancient+times+to+1492+pdfPDF 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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 18228 bytes
SHA-256: 3922b00de1c998a357424886dde5ac611abcac1f81898a17baed39b20f69ebe4
font_01_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 11380 bytes
SHA-256: 02a94da167d17c69316a6a0702a2b3f5f66b2ad43d1c7bb92cc25d5838ba3ade
font_02_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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