Malicious PDF — malware analysis report

Static analysis result for SHA-256 eea25dcb6de66d99…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 02:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89148890fec0b8c2fb6acd2fbbb1912f SHA-1: 69be412fc1e09f23d7cb1491ccca639e67a83c9a SHA-256: eea25dcb6de66d990b940da7b747e8e0ea602f004f040b1f64ea26fe67106d86
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

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://drafthe.ru/uplcv?utm_term=take+backup+of+android+phone PDF link annotation
    • http://due.pt/js/ckfinder/userfiles/files/dudififakavivaxoligosesu.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/23815222097.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/75822896399.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/tunamik.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/xizowisituxofiw.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/pifojodepuzojokataxazarex.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/38640502217.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9fbc56e25---mifixotidaf.pdfIn PDF document text
    • http://voijin.com/userfiles/files/sivazolijikuzora.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/9693540489.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/tevakovobefivodumupare.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/befulix.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/38350753677.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/bowagiki.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/nujikopositi.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/81189410468.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913115052_6fzx33.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/faxifexaduxunipup.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/46898277102.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/19757672475.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/91096485847.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/39896873477.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_off0000affa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFA 10700 bytes
SHA-256: ef70ba0434360202328321ab508f65209b8856979442e230eae5dd1b4c66fea4
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 16380 bytes
SHA-256: 2a90842e90b96965f665fc0f09aeb7fbba2a32982f2f0e8f521ca382e8c62868
font_02_sfnt_off0000f19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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