Malicious PDF — malware analysis report

Static analysis result for SHA-256 8675facd83e9c7a3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 17:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 624b8baf1c255facdacad95859ea7d3f SHA-1: ff6bdda76a8fe57c5d2b8d4185e1c4c5b0a2c7a0 SHA-256: 8675facd83e9c7a3f5dd573fc28ee6151cf11dd6595dd6464fe247ff520c6adf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://nomylo.ru/uplcv?utm_term=pokemon+modifier+emerald PDF link annotation
    • https://carcable-bg.com/uploads/pictures/files/bimisalatid.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/fenimof.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/raxirefipaginazetu.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/sevuzewetabimabugozedekid.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/6348781243.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/diruwebapa.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wenumorepegaxani.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/xuzifezisefosokepozamav.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/xevozuvejosivesejajosi.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/45547012823.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210917013319596.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/67746821487.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/dafix.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161401c1cf09c6---towarebo.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/31541473065.pdfIn PDF document text
    • http://unseretochter.com/images/file/44597286501.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/bulad.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/dedegapimejawofofunine.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16145eb545885a---20840384240.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/6635014855.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/76697302163.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/tolirawexolenuri.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/jozavusa.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vapiwe.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/44923494638.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_off0000c466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 17576 bytes
SHA-256: d8a57dc0785115504c2dee230ba04d05d693fe2bf08c80f3f347401c2f5038f0
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 10344 bytes
SHA-256: 9e7b22421eb92f04a611e7eb8ef1b7b43294d129a56692d3e9abf64b58d38231