Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db22859bb3ce0e7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 20:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6511f664590842c04527912e8ded755 SHA-1: 7cb7a976a8958fae0c07df560d8aac2d1968c105 SHA-256: 4db22859bb3ce0e74036cb4e33c05c33c95410534f36ef89cb14a5337b05d775
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or distribution network. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://tranindo.com/Uploads/userfiles/files/konukaf.pdf In PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/dixebolojiburufowufeseju.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sojikodewuverilaxejo.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zarurivuxomabix.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/15447767269.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/tenovabitafedab.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/61807883996.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210910_151949.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398394c7501---69582209110.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/lipoj.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/zagemixixaxujexosu.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/4147356146.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xateku.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/kudebuvoferimis.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/30701347770.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/miroguwejuvexuxovibufipob.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/36785894084.pdfIn PDF document text
    • http://prota.ru/upload/files/tubub.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kinetejirodeginejedow.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/pizuvojataxewadoluzil.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/92133176591.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/32473439739.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+brief+history+of+time+pdf+in+englishPDF 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_off0000db5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 18460 bytes
SHA-256: 13cfb546916e3c7adccae54485a7aff1c2182ada8c11ed2dfebf0bb6928fb851
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 11016 bytes
SHA-256: 89a76a7dd2f4865344421572f2dd1983527d5ae13aa8bdbb40b319e1d698f2b8
font_02_sfnt_off0001242f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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