Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a8ec2893a52f5d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-13 17:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e15be8052d964c6f270b71679ad4678 SHA-1: a208bc061ce828a1619437cce146929ddeefb59a SHA-256: 40a8ec2893a52f5d24472a1de2186306018a5ce9349ba67402c351adfef04da9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content or phish for information. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da6c90737f---25840107204.pdf In PDF document text
    • https://ximangcampha.vn/upload/files/446181564.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/78090956799.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/80333248297.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/89284273292.pdfIn PDF document text
    • http://www.pvvc.cz/files/79456789078.pdfIn PDF document text
    • http://gibisch.com/files/files/litilenufukazazawokivujes.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/93688329218.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/damovedugi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bojerojulubelologevuzapi.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/wogowitoxaf.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/10483376432.pdfIn PDF document text
    • https://okazionche.com/files/4877548935.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/siminuzoxerepe.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/87945063734.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/79654505257.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/wenugorimetadoneb.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/59407714636.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/27798602401.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/kurosiluzolagezinigi.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/bibodusupe.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/tatako.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/faxebewujarameje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+swift+life+apkPDF 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_off0000b7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFC 16368 bytes
SHA-256: c2f2196c3644e51e0960f396a8dccf3e02dcb8f7a3640a9557bbbccaf8d9a13e
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 10272 bytes
SHA-256: 2c62f1ac499aa5d2a9ffdb47038a9062049548835f856b857ab360ecc4f224d3

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