Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd8b1dfdc846a16…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 05:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ef9b9ba3bb2f8616f3ff347b11a66314 SHA-1: f6289ef2a00f2b9f4afce95d90f42f045ff36e1d SHA-256: 8fd8b1dfdc846a1612352bc19fd680bc3e53d6168ef88ff4c58aacf9b48eafe7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=how+to+export+one+page+of+a+pdf PDF link annotation
    • https://anandamsanyal.com/userfiles/file/54933644401.pdfIn PDF document text
    • https://henuopack.com/d/files/befojarivi.pdfIn PDF document text
    • http://balone.net/_upload/file///vexadevosatazunu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132f09e1062b---66390616785.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/63972469755.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/tanotubujuxumezut.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/xupapejivimogiziwe.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210916210011519941631.pdfIn PDF document text
    • http://i-dron.cz/data/file/85209389365.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/sawotedeva.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109100711173671.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/boburadon.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fupidewuromobavisezavefow.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/78609943564.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109031856137889.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/nepubota.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/dapaxunogigevegirezobeje.pdfIn PDF document text
    • http://geotersrl.it/file/34380875453.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/10201485825.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908232612824375.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/rategixap.pdfIn PDF document text
    • https://rosycaffe.com/file/65054256523.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/sitaf.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/50940504380.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109100533302878.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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 19016 bytes
SHA-256: c41a0c7f8b37d65150ce1f3e367149be81569a7c10e20be817af8ed66f2f3654
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 10544 bytes
SHA-256: 20b3f474b4b2ecbe022229fdf3f585019314a99456c91f7ce80bec2966314a31

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