Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c10d4e4f25a6ca…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 06:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3223cb0edeae09f5b525d6afccb349cd SHA-1: 74d0271162fa3eb098d99227f1f38363d888f069 SHA-256: d1c10d4e4f25a6ca23a85d38ad7e38c59a34602c374d961703c44edddc536042
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also acts as a link farm, directing users to multiple external URLs, one of which is flagged as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cukrarska-vyroba.cz/UserFiles/File/nakaxebegopipesabisa.pdf In PDF document text
    • https://blueparadise.pl/userfiles/file/32390583849.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03cce61ca---fevojopefa.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/jiwapalivenuw.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fewikekugevepasolosiv.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/37928579005.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/javabefulemorosuvifasetit.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/34138162173.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905022558.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc796b6a99---45414057118.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/zokimiranofojariluf.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/8636790330.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/11228169925.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/gudenobosudoxumegudenixuv.pdfIn PDF document text
    • http://devveb.net/userfiles/file/26742429177.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/79972450804.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/60600557428.pdfIn PDF document text
    • http://signfabapp.com/ckfinder/userfiles/files/61642700358.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/bixisedesug.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/jurovagivoxasoguve.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/24358590928.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///mezowoloj.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/sowapixuritefazed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=downloading+bbm+on+androidPDF 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_off0000aeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CE 10420 bytes
SHA-256: ca13b38bd902a25dd12b443627964de1ba0e1f4b83d6958161b334f310c18250
font_02_sfnt_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 15708 bytes
SHA-256: c473400504cea7100900dc8be4f711f132c65ff209660e4695f120477af2da70