Malicious PDF — malware analysis report

Static analysis result for SHA-256 b979737c540f9df5…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 06:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e5c4761befddfe28631ab3d59a23d632 SHA-1: b72eff2e609a5d2ba2912fd70208cf7c4d021150 SHA-256: b979737c540f9df5ad297fa70d020dedec8a3c62dd469375aac67eef8593d663
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to distribute further malicious content or phish users. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://gamecoast.by/uploads/files/lijojovimavata.pdf In PDF document text
    • https://kebecelectrique.com/upload/editor/file/15670707649.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/14302213754.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/kodulekimipazogaxeji.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/viwagopuneporadazizuwovel.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/10128228421.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/mawobedokef.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/pesisedozavelawezikawox.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/66543372116.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/71069545529.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/jizexaburorovomipopodida.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/40254675947.pdfIn PDF document text
    • https://sitarasign.ir/data/file/semoxudofi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4d65f34b---29132630387.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/21809195442.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/wowemejoravimoneri.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/nakebuxawaxajir.pdfIn PDF document text
    • https://subded.org/userfiles/file/52041342951.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/89176249802.pdfIn PDF document text
    • http://sbairs.com/datas/files/jowim.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/semunezetutaketemajenif.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/migemageberofelak.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/segitenuzuworuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=real+body+scanner+app+download+for+androidPDF link annotation
    • 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_off0000b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB590 10900 bytes
SHA-256: 0ef9fa2246e5b6c1e8167b34b117be31b2c2aaa91e547866eeaaca5a47986f5a
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 16612 bytes
SHA-256: 538725c446c3902402ad753891ac7f015c3ce205f8d19b774415585cd3c7fb4c
font_02_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1