Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a0d36200c14e71…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 20:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1563323cf7531bf2c9d5369f77bcd25b SHA-1: 921307e4ed4209dae07885337f0c9b3f2fcf6444 SHA-256: 98a0d36200c14e7116bc504bd4a1b534b83dd7203d84a16eba10022a4c6c2430
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, likely to distribute malicious content or phish for credentials. The presence of multiple unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://china-glass-mosaic.vegner.com/userfiles/files/20210905_102334.pdf
    • http://sjar-tech.com/uploadfile/file///2021090213464283.pdf
    • http://lagostena.it/userfiles/files/mabezikufavaduxinoguk.pdf
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/4222072565.pdf
    • https://morabia.fi/images/file/bogabudifanozurizowaze.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/86761078167.pdf
    • http://kamerton.nl/clientfiles/jozuwubulituxixidut.pdf
    • http://tubemakingmachine.com/uploadfile/files/nagam.pdf
    • https://transmar.biz/ckfinder/userfiles/files/wigovuwozavonukurub.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/legogutasujap.pdf
    • http://melodylavernebettencourt.com/media/file/49642246052.pdf
    • http://kleinschadenexperte.de/userfiles/file/45180032174.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/8723874373.pdf
    • http://geriatriccarenewjersey.com/userfiles/files/biragamuvemulesagoxizuru.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/16d4444a00e7b3be1c87bdee31b65bd7/sosafuvigosezisugi.pdf
    • https://ww150006.linebot.net/upfile/files/20210901114917.pdf
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdf
    • http://idealhca.com/admin/images/file/wejesakosopun.pdf
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/8545032062.pdf
    • http://cyc.cz/pictures/clanky/files/wopurabexemuguzas.pdf
    • http://hanyuchina.com/upload/files/7274895065.pdf
    • http://b-solutions.net/userfiles/file/vefemisip.pdf
    • http://dentali.cz/files/files/pelokom.pdf
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/zolebozikuraleradoz.pdf
    • http://ferrocom-spb.ru/userfiles/files/65216089857.pdf
    • http://azs-szermierka.pl/zdjecia/fck/file/sozenetopav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gta+vc+deluxe+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4f5.bin
2a42544215e637b2083c76be1310e8d39f18f6e2bf843fd04cc1aa4340d4749f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 15168 bytes
font_01_sfnt_off0000db2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 16792 bytes
font_02_sfnt_off0000f346.bin
9bfdeb1065064b6ee0da05bdd9612f716977c0a717624cda4f4aab201b37364b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 10608 bytes

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