Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6377750150725f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-28 11:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 16bed9d041cb9320bc76f9750c690dfa SHA-1: fe863648ea2674e39d8fde69af37c3c52a64af5e SHA-256: 9f6377750150725f643aa3a849d3f29c28340225de672808b9ce849faf82376a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. The PDF contains numerous external URIs, many of which are part of a link farm on disposable hosting, suggesting a phishing or scam lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the PDF's primary purpose is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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 https://cructi.ru/uplcv?utm_term=unlock+tmobile+iphone+free PDF link annotation
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142670388f6f---60965614607.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/feripogubulidos.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muzipogaxolexafiremaroti.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109132252404655.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/99027029752.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/368105772.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/19091107656.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/69735173116.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/zafisedadujisosemajejax.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/14544751520.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tukibupe.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/74063696090.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/52500958010.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/fuzixudodosodik.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/74089013560.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/xezanozinen.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16137185b854c6---diveku.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/09/20210926145551.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/24054248697.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/rodukumajaf.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/bivaroxifuvu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210904_70EB6FBFBFE81931.pdfIn PDF document text
    • http://uhorder.com/upload/files/tarukomekofaxusopogat.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/dejewunikomevaxadogojuxeb.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/b26ig76j458b0h8279catofgv6/dejetojivikumaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 18924 bytes
SHA-256: 4305b880b55c7b8811787f5c19de03ff5636ae8acf6a69ad676cf3a58dca425d
font_01_sfnt_off0000e40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1B 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_03_sfnt_off000111f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F5 10652 bytes
SHA-256: bdc6bca6beb0fab0df80ee69f21d56015e89169b02b8eece78b9845b71011b8f