Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25864725711c841…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 23:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4aef7f880c935557f26af7c946909aaf SHA-1: ebd225654fa2eb44703531c9c8409bd6ae67f186 SHA-256: d25864725711c841554abd5f8d26d53d17d2740207a8cbe66ab4770d4d77cd1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of links pointing to external PDF files, many hosted on disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://bedrucken24.de/userfiles/file/58799743078.pdf In PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/wajizigajof.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/tebizojaxagazolas.pdfIn PDF document text
    • https://ratosatu.com/contents/files/jivuwasewasixulege.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/42397655602.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/74426827095.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/42936554458.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/39391556897.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/97164332450.pdfIn PDF document text
    • https://isleo.com/i_photos/file/bitavuwewimejexobededaliv.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/35907632420.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210903101244.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210903202753534341.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/juzapisiwa.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/84535001682.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xidokogorepinono.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/monavofezef.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa03b55dfa---sixozumikoxevake.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/fasiga.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xutawitupom.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd46457e9---regon.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/rodewatokulirukizopeta.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908010750_c5jj8g.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wavaxudedejotobip.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tilaler.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/dofibavakabofanozen.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/89400025335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=5e+character+sheet+pdf+fillablePDF 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_off0000c1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DC 17940 bytes
SHA-256: 8d9dd3dee707e566a2103f7418fdb72b51ebb0c6010468f9add38dffaf324d73
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10672 bytes
SHA-256: eab7db8edf0841bba55dedb80f66074af65abbb1d1ea0eeb5590dfe200ab6042
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1