Malicious PDF — malware analysis report

Static analysis result for SHA-256 2682899e82ac1856…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 20:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6a77866d5a0d44e3b68efa41eb5e908e SHA-1: 934dffb4e060d545e9bec386b6b362d7c86e5799 SHA-256: 2682899e82ac1856d812d3aa08ef49a5df3e9d314a863ab58340267f8a4382bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://jasmijnbloemengroen.nl/userfiles/file/76012213906.pdf In PDF document text
    • http://jgweld18.com/UploadFile/file/20210902222355957.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/dizowiv.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/daxabukurejewu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/78496832520.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/ridugitofekasilisisuz.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/xulewupum.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/pilevakogoz.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/59939224845.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/59939773729.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a3cff25396c4281b4a92a351f181623/tutajozabusi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9e267eeb---77683573212.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/vanovixexenonalikixodoxex.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/jipopekiwubuxemarugodix.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/subuvubawonizevulo.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/7016970583.pdfIn PDF document text
    • http://pinxedien.net/upload/files/pofurivasonuz.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/fadakuzelovesuxe.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/78586038798.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/rijawebakarisevamunivawov.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/kugoxawudemura.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/84040255850.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/pupakazumewelete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+activate+dark+mode+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_off0000c789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC789 18168 bytes
SHA-256: b4502154c62094841403f4a21cbfe65dae2c8d58c998e66a068b3fa8dad07fb2
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 10552 bytes
SHA-256: cfac4f54c58d058e2b0460edbc7d135042a47b66fbbbcd4b8ef71b5a2a83819f

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