Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15c3c048642c04a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 22:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 942a223c2244eed334b5f042aeaa045c SHA-1: 32ece77d33b3549523e41d16dbedd57cb1f26a20 SHA-256: b15c3c048642c04a4da35b1a1c8278f4360e99f15e498b9080f092601162e60d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://medvor.ru/uplcv?utm_term=formula+for+perimeter+of+half+circle PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e90e29040a---nenuwaniwijinezenilipo.pdfIn PDF document text
    • http://bulmarconsult.com/files/woworewilozudejub.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/vikemubitafarutapu.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/depekasames.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kofevop.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/95478653370.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303feee5ff9---bajuwizurimifavesevaje.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/70606833289.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/famazekedujisegu.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/53984161393.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/57777867410.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/12715327743.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/81255356699.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/35729366580.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/binugimaxis.pdfIn PDF document text
    • http://chenruichem.com/upload/files/pidosixul.pdfIn PDF document text
    • https://tsolisp.com/files/file/rewekofuvapes.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zikefabozilatanemurubi.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/nudexetubavele.pdfIn PDF document text
    • http://juentai.com/userfiles/files/dipivejiworir.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/japoxorixosejunulos.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/mukamorip.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/17675128906.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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10552 bytes
SHA-256: 05b8c74a6f8568eb26a85e19771196424c782e1d16600adf548a304fcd56ee30
font_02_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 20120 bytes
SHA-256: 47438b45e3cedf0c2b44e92003295ce30f3a3f29776cb4a91660000b0776c1df

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