Malicious PDF — malware analysis report

Static analysis result for SHA-256 da54032e9ea45e1e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 16:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcb92297084ffdcbbb7c91de3cb50f5d SHA-1: d2fcb214adcf893aabc2386ee2d844c5c799918b SHA-256: da54032e9ea45e1e4c040927043bcbb73be80ca64b2aa6e5865c6885bad424e1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding a large number of external URIs, many of which are on disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://inwebjor.ru/uplcv?utm_term=bared+to+you+full+book+online PDF link annotation
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/polasiwikowewivu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1bbeb1b1e517ea6f4449b779b25e0288/76501125120.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/41263324919.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/rezanogekufufonoxa.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/xapavunujumonutos.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/16365737680.pdfIn PDF document text
    • http://yongqingtech.com/d/files/12069768775.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/nesabekadomozokugagovokom.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/41100839208.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/28762551195.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/85529132838.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/95229114427.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/toputipobogek.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nogewike.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/tilewixawidepupobavusu.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/27138776260.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/xinegixovivizolakoxiku.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/sorurefibafisotab.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/rawokewipex.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/lovabuz.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/8192061150.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/ruwajedisil.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/43370191332.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161300efdc7091---nodenaxurivoranu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/fasiwaf.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/55819926323.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/velatavemubumox.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_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 18240 bytes
SHA-256: bb04353ce931ef1679747f242f223c60403415e99e4d497d6f687f3db968e27c
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 10676 bytes
SHA-256: 1188733dfae0a8651520e9026c850cdc328412beb20e8947542543a1ea951951