Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b9609b46ad109e…

MALICIOUS

PDF

93.9 KB Created: 2021-09-14 09:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aecfba978195417e1bb00ba55258a28c SHA-1: 491a898c520886597d5d69d1a7a04b4a997100f6 SHA-256: 77b9609b46ad109e5ffb2c0dfeaa03eeda2f1bc220a545c347c6808db939a6ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm designed to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://ikuma-car.com/js/upload/files/jogabinomarenefinalu.pdf In PDF document text
    • https://floridahouselottery.com/test/userfiles/file/26248782904.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/5657434849.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109122107586328.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/68186245822.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gawinetodufedeze.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/nelazega.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/27256240075.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/59211169660.pdfIn PDF document text
    • http://zerosquareonline.com/file/zonazeriwakar.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/wozelipoxemik.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/bukesulovirarizepi.pdfIn PDF document text
    • https://limadelimon.com/images/file/fekigodinodubalizineko.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/nateraxanaminabone.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/7570165250.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/zumuse.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/29292696014.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/bugojarozete.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/70547122254.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/73328255442.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/wonibitirevobogoj.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/begedojelufi.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/41938563014.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd6d5011---guvadarunaruserafibekagip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wallsy+hd+wallpaperPDF 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_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 10268 bytes
SHA-256: 67cd7a3690266020e23ce9f76cc8eff49eb9963cb5a8c07adf391225465c63a4
font_01_sfnt_off000122f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F0 18276 bytes
SHA-256: 8907c54078558ebbe1406c330f570964770a291a951b969ba27cd3d4847603ff
font_02_sfnt_off000151d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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