Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7950c0f33cb40e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 03:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b2d874b74f8ca1c24b148a74f0be58b SHA-1: 7b0a2c03e0ef31b0484d20d593f7544f1bf31e4c SHA-256: 2b7950c0f33cb40e570c8789f3a330a2ac67f2f88ac4f8624f7fb0740004ec8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was delivered as an attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crewmak.ru/uplcv?utm_term=the+oval+portrait+edgar+allan+poe+pdf PDF link annotation
    • http://belean.pl/userfiles/file/12138934777.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/guwelizabuda.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16132efc0f3032---vejiwozafukasak.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nelavijevikalivi.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/26807273970.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/66313769060.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/23422980363.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/dubosoluxeru.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/776154782.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/47482345323.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/wesuxamezomuwanaketulapov.pdfIn PDF document text
    • http://klhl.com/userfiles/file/xukaxeboxanipexemuso.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/tilaxotutamipusezizebux.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/55022054049.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/tufofurumezu.pdfIn PDF document text
    • https://bselink.com/userfiles/file/35416839029.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060458529254.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/zebibuf.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1790940701613730a4569b3.pdfIn PDF document text
    • http://tajilin.com/upload/files/sofebado.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/87396970638.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/noxel.pdfIn PDF document text
    • 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_off0000b417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB417 10636 bytes
SHA-256: b57dea8baed5ad5bf2cdf86759fc0e9dee5316c487ee7f343a4455aee6b681a3
font_01_sfnt_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 14720 bytes
SHA-256: dadf0507d11b13a842768bd662b094c16fea967290af672a20a02903fa27e38c
font_02_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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