Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bde8ba36dd369b…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 09:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ea90fd5e165e7ab56f8fd41bfc2e897 SHA-1: b46d7f6e39986383f642ffa260967b5c520b9b60 SHA-256: 71bde8ba36dd369b21941771f7c3908d010747aee5168db19a3c5a8d52793b86
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=free+sites+to+watch+live+football PDF link annotation
    • http://jingyilin.org/uploads/file/97917084419.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/pebutus.pdfIn PDF document text
    • https://kermanrooz.com/img/files/54455804717.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161440dd6105b1---27018372786.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613988de3f79c.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/liniketajukituzax.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/sojigamigafuve.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/bebimefoneruliki.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/14939390306.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/16947222614.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/35531968542.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/pizudikajovezo.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210914150718.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/80850618271.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/pigudulinumidubejugakom.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/66893180422.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/todef.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/foxiwapoxoti.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/fozav.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/90721599015.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/10197594231.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/56031588070.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/setazulob.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/19fck0h2lbhslga9fj51uc8nuq/90255866511.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/69619784242.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/10589167766.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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 17552 bytes
SHA-256: d5b819592c7933dfb8cd0d8dea8eb413986cdfa3d8e8456af2ca323e6139801f
font_02_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 10596 bytes
SHA-256: 0e701611ed6cea045f7c127ed3ae549219cddc94e7b666e31647a4f7426f1fac