Malicious PDF — malware analysis report

Static analysis result for SHA-256 de07e99b7c638134…

MALICIOUS

PDF

68.9 KB Created: 2021-09-18 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d61f6e5f548c206a5e062c90553402f3 SHA-1: 29655ce3648ea906c5dcc8d1bd0bf1efb801bb67 SHA-256: de07e99b7c6381343ec1a83d5dfbc650a8eb164fdc8ccf084d1f79fba153e318
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains and configured as a link farm. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f80144e329---wufotidupuzox.pdf In PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/zugaxalabisepar.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210902103517.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///xajazonaxo.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/72565565386.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/xareja.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///56362478761.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/70918238092.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee77a467db---tabewoke.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/xijipifigewitefusex.pdfIn PDF document text
    • http://ahknchem.com/upload/files/91375907863.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/jabutaxoju.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/35975589426.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/24881539762.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/4879320875.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109071645226102.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/91141139961.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jixexakexizaniwore.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/70734796751.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/75835103773.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/sorugur.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/86412144659.pdfIn PDF document text
    • http://fitviewer.biz/files/file/69511768068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=365+dni+read+onlinePDF 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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 10352 bytes
SHA-256: 62ae4ce3b47a5a64096c9a9d69bd0971c9de99ecd36604919cb54558a752c438
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 14636 bytes
SHA-256: 8321f0bd8d351bdf24da74f02a29c1bce3efe08c854fa3bb7bbabd8043772449
font_02_sfnt_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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