Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcbdb8fd73de471…

MALICIOUS

PDF

67.8 KB Created: 2021-10-04 10:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2249b36b9f971a6befc11994876303a SHA-1: dc07de8802b0be1561532b7f87a964b9391222d0 SHA-256: bbcbdb8fd73de471ebc89e9a5bcd4d09bc872091591eab7c641a26827d65841f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dongshengcable.com/images/upload/File/45349630675.pdf In PDF document text
    • http://captainkillmite.com/uploads/files/202109302052361353.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155f9c01bb90---54575499465.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/gisudovolep.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/45277684199.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/ladodixaniduki.pdfIn PDF document text
    • http://kam-era-man.com/83328555365.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/rudigabuken.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/senanekawanirifazefe.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/82436736374.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jisamepavok.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/63642397730.pdfIn PDF document text
    • https://5udua.com/contents/files/13583913350.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/93581695813.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/27467905454.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/47475867119.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/16460829323.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/dupalifir.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/xuvotareroponufugevop.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/bugowa.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/51501898051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=can+you+steal+in+slow+pitch+softballPDF 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_off0000aae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAE7 10948 bytes
SHA-256: 6be12f3f68cc85e781c086880709b3e4372390c91b1671efd5aa7fc8d5025399
font_01_sfnt_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 14808 bytes
SHA-256: 6555ce9e809096885edf3809192b049134c9deac608cb8e211a54c749461c73b

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