Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c11d9c89b2ab2b…

MALICIOUS

PDF

90.4 KB Created: 2021-10-09 16:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5db62e167f89973de624edc38146a4a3 SHA-1: 6ab0bdcc28c3b41d38f658b2764d35cc0983f5b4 SHA-256: b8c11d9c89b2ab2b6087ee06234bf3dab9335e35f1700351e020fea74676f461
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a large number of external URIs, many of which point to potentially disposable domains, suggesting a link farm or redirection mechanism to host malicious content or phishing pages. The presence of embedded JavaScript and numerous external links indicates an attempt to lure users into downloading further payloads or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://computerdoki.hu/user/file/delowufenor.pdf In PDF document text
    • https://tsolisp.com/files/file/74432110844.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/32401165119.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/90100430989.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7f476b787---nerijagaminuxijutet.pdfIn PDF document text
    • http://canadianrockies.info/files/file/30114778535.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/waxilat.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/xixowijumob.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/sotibutafefosevij.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/mepujevonuliwamedunago.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/2432695470.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/93217063665.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/45998464269.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/50937441797.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zulenese.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/jumazaruxulawarejebalol.pdfIn PDF document text
    • http://pasaru.com/upload/files/32856541239.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/finuguwulosolesuzodadi.pdfIn PDF document text
    • http://baove24h.org/upload/files/48765325599.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/tapaganojasegu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///fumazumuvobof.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7367d1b6df919b586441ae811b8dd528/pusoluzotuxidokex.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/90262291262.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/zogokoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=pebble+and+the+penguin+hubiePDF 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_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 10524 bytes
SHA-256: cac7c0e77faa9d88512042c1d9449e5b7b6ba0a77e857247dbde3f9b44552451
font_01_sfnt_off000113c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C9 18816 bytes
SHA-256: 871d7accc4b12a355e759eaa771584c9f3d5d78966ff009c2af897c83981d8c1
font_02_sfnt_off00014441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1