Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e8cb320d290a50c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-17 02:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cd7baaa9c24a0e4d0f569c720667144c SHA-1: b35d876cc0c14dcda085b3b04776c1a261d53005 SHA-256: 1e8cb320d290a50cb4e8642436213ba94b4b1db7f059c9236b16e9c68f36593b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous distinct hosts. The embedded URLs, such as http://ajarnveerapong.com/UserFiles/file/wakeferabinuj.pdf, likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://ajarnveerapong.com/UserFiles/file/wakeferabinuj.pdf In PDF document text
    • http://scandirent-new.ru/uploads/assets/file/nefukutanivatifera.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/10820829987.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/32993865424.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/deverikolijipebugi.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/47214238506.pdfIn PDF document text
    • http://goldmustang.ru/files/files/7478733750.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-2/20210902051918121297.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/50825437603.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8d9d6745e041023239934363d02e3556/80837755337.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/gaximumogage.pdfIn PDF document text
    • https://bfull.ru/uploads/files/fagatelekabu.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/ponumixebadad.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/68678546002.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/50648594249.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/roxajixakinexav.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/zikek.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/fixamudezaporujulapeg.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/94348614882.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/60424185904.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/90832625047.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/385477277.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/29169673562.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec86bc0---85665816384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+tv+pvr+appPDF 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_off0000d8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 17984 bytes
SHA-256: 9dd29d1c5e8ddadc609b3d19d848d62f683a894f68930a5e0f3967acc12f6cc2
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 10088 bytes
SHA-256: f930ce0171f962a7b3a48e9546a1511e4e3c8fcba937bb65f9f29c03e3567e2f