Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e6976a30417f69…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 22:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c7e48d2602a76d92905655a1129d237 SHA-1: e7ae83e1e418a317ab1eff636660da07c7b6f148 SHA-256: 27e6976a30417f6948825a0ac63b41284db0ef56a4313691c67d072c3d6f2310
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to external PDF files, indicating a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://castudio.eu/userfiles/files/16639937119.pdf
    • http://contextuae.com/resimler/files/29056092146.pdf
    • http://falconltd.pl/cache/file/gugetirajumewegejini.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/7054437871.pdf
    • http://szjglaw.com/uploadfile/file/2021090221480773499.pdf
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/damekuwebax.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/bidiziwupol.pdf
    • https://bhandarisurgical.com/ckfinder/userfiles/files/fuvezesiwotasut.pdf
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/wugaxewofamulal.pdf
    • http://hongsung114.com/files/fckeditor/file/xetepo.pdf
    • http://jj-metals.com/userfiles/file/2021091804283173499.pdf
    • https://kede.org/userfiles/file/dupasasizunilakaputadamo.pdf
    • http://www.cottagegrad.ru/files/file/xopoxepufovorubixorarid.pdf
    • https://fnb-concepts.com/images/uploads/files/92016964334.pdf
    • http://frangarcia.eu/upload/file/rukonerevunalem.pdf
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/31161700218.pdf
    • http://www.benyowsky.com/resources/files/rekabakule.pdf
    • http://monterroso-construpuntos.com/campannas/file/55704075487.pdf
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/xagefegiguvufuwurukusaj.pdf
    • http://www.kickcommerce.com/userfiles/file/42227560477.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/eaeb177fd98190fca2662294e7f94710/medanigalukesutesabofate.pdf
    • http://jowinbio.com/upload/files/202109080130347299.pdf
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/gotebomisefo.pdf
    • http://tichdiem.surecare.vn/uploads/userfiles/file/rinawigefodul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=jar+to+apk+converter+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d381.bin
46fdd8ab7622d27638de428bf26f484b9bf9ed95e6883a07ade4880fd62e8414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 10548 bytes
font_01_sfnt_off0000ebb6.bin
fb5eded045dfce6bb99cf675baed5c66066b81d312e3dca57fbab4e919fb11a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 17156 bytes
font_02_sfnt_off000117dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16792 bytes

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