Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a585e59e640b50…

MALICIOUS

PDF

108.4 KB Created: 2021-09-16 11:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25660a26939ffcd0599b320571a2a699 SHA-1: 677fc54ed0fb8f8bd96e7dfe7147525d4fc63013 SHA-256: 04a585e59e640b509a2c6e4ce997f339a84c88e6bb4ac983c43cced25e521c64
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to one of the numerous malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://smidgel.ru/uplcv?utm_term=o+vowel+sound+words PDF link annotation
    • https://lifesmart.ro/ckfinder/userfiles/files/tipagiligepewu.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/tawugesopoku.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/95924141655.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/pirovozipixazosofezo.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/vagujelunoke.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/38039857524.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/46406420857.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/55052623896.pdfIn PDF document text
    • https://upaspor.com/resimler/files/talujomajug.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/33232633473.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060712002615.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/75561638508.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/dilusuputodimijixifi.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/dajolorugonejer.pdfIn PDF document text
    • https://halkum.rs/files/92960750075.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/f9pl8p0ajqtnc3sha8mrbclu6l/82566021728.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/59000120908.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/wasexak.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/gilimisitebofepelipanorap.pdfIn PDF document text
    • http://asvpp.fr/pdf/wulitusekodajune.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210909_2699ADC90E27C263.pdfIn PDF document text
    • https://magatek.com/documents/file/16395264340.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_off000146a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A1 17828 bytes
SHA-256: 31f78d87c3c6725a971180391d98ec43fa3ca30300e0518979eaf595a8ada8a0
font_01_sfnt_off0001750b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1750B 10164 bytes
SHA-256: 8c9d62f6212694a91e2cadfb90dbbf9ecd27c111013b72e980dbb4bef52ab203
font_02_sfnt_off00018bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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