Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a57c68206ba8a79…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 22:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: da82300c3788e5f920a41fe9a61bd579 SHA-1: 94907899fa98fff754dfa6c5ef965845f2ccd204 SHA-256: 0a57c68206ba8a79407351b22a9aad8550359ef85d41f38263e7fb1f760abdb4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate or execute malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sacoorhealth.pt/site/upload/file/wadejonaxexagevejo.pdf In PDF document text
    • http://vervesimuhub.com/userfiles/file/47594233040.pdfIn PDF document text
    • http://posnlks.com/UserFiles/File/powabipexomefomubokuxuj.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/luvodifax.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/69927468395.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/mosomosoji.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1140a571f6313658a11a078649323e28/82068373273.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/wegonuzuponesupobu.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/giguxinezuga.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/dovelam.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210901171802.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/sosomubafagogu.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/44579390479.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/19176008309.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/gerepepikirasakupoma.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/25933293413.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/96873574491.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/47671843385.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/67988881494.pdfIn PDF document text
    • http://recviem.ru/img/upload/pagasimamegegivoparoxagix.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fumedirulisomo.pdfIn PDF document text
    • https://mklaassen.nl/images/file/walivadiwabuwinozufofiso.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210915142152_wfz6uo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vprf4jitpdmpuhcvbdqtcp9maf/18622439229.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/fufebow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=jc+nesfield+english+grammar+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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 10840 bytes
SHA-256: 18808ec989ca8db3a85443ac10a07d870d5004a39b5f85ba3cc8c0dcd30d2725
font_02_sfnt_off0000f95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95B 18100 bytes
SHA-256: b9061315cad23e7c4170acac1e9f875ddb32d2df550de448a596ccb76721cf06