Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a16e0b11dae851…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 07:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9648b548d990db48d19e50460e388a7 SHA-1: 84ccbfd8abbf301d202ced41a1eeffad0d545f4f SHA-256: 97a16e0b11dae85178dc7d0560d350d1be07d1faf03f6e85787cc69d2bc46a2b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with one pointing to a raw IP address, indicating a likely attempt to redirect the user to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document's purpose is to host a large number of links on disposable domains, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://accessiblevehicleservices.com/userfiles/file/34323859703.pdf In PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/vorebuwusod.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/sifuger.pdfIn PDF document text
    • http://maidichike.com/upload/files/dewukepijejaxexe.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144d9832aea4---sasetuziwazenewanevab.pdfIn PDF document text
    • http://gdgom.com/upload/file/210903001200436674czyzxt14c4zh.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/fanifatikebigisepopesobel.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210908_98943C4DE74B5433.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/67290980189.pdfIn PDF document text
    • http://vejwun.cz/images/24201555333.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141940d05b6a---nawifofutojesez.pdfPDF link annotation
    • http://kielcenoca.pl/files/file/romupeb.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/gejujifezojewe.pdfIn PDF document text
    • https://digireg.es/upload/58783482622.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/15079016886138d74461ced.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/bopamimekatapavijasil.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/nugile.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/nudodoxukurejoxunoguwe.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/vatitog.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/39292141595.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/koxifujesemevorijogosip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=capcut+video+editor+downloadPDF 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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 17904 bytes
SHA-256: 641e192666984b8f1effa9ff64d6692390b712719483b1475304ba89b3728ec4
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 10620 bytes
SHA-256: c2a8a0f94de9b872533871885d48356542d52328dbc18914a2b0f6c308969159

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