Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f972a1b9a3ab491…

MALICIOUS

PDF

83.2 KB Created: 2021-09-28 20:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6032e265355aa47f7a93da7011235bf2 SHA-1: 8275efe345e6259a587fafcdf5be70fd22f91ad2 SHA-256: 4f972a1b9a3ab4917e060d8a5634107da7c2b703d18e9d96d9582775fb29d270
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a phishing or spam campaign aimed at driving traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=cara+membersihkan+sampah+di+hp+samsung PDF link annotation
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/75163673332.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/xuxijarobinaxovukapo.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/43581030620.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bagekawewasesozebuwurax.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/miziverizowe.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/cnmaei2ld6vh646bp0edkl27l6/fukawivexurawabulifetasut.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/jibebi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/gedejumu.pdfIn PDF document text
    • https://oferta.lt/i/File/salow.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/gebokonogifokaso.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/34958233500.pdfIn PDF document text
    • http://pb-book.com/user_file/file/dabixonajoli.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/7830621738.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/moxipajugepe.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/14306533712.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/51782123724.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904114443.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/wekupujetijanebuzawowabu.pdfIn PDF document text
    • http://ed-union05.ru/files/file/wonefosonavagemuxatufos.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/1042833645.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/26229790050.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/48730042123.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/loratapomilije.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/54945711794.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/sifajaxavasibatizawabigim.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/55d3690c922765930536da8c00be6010/piriga.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_off0000e2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 10936 bytes
SHA-256: 5ce1b6a9968f7c5f8434c3cbae148251a4915674cdb5a4b0fb6f9e76cf78e6ab
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137D 16484 bytes
SHA-256: 7e4a60d82a3c98b7983e91595a304af609ca1a0c51eecf8b3ef38c14296387d3