Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc828e9d81258c3b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-11 23:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a60736e88add291c422e873185f39718 SHA-1: b66097b02aac6fa75f320a32aff7eab756a2aad5 SHA-256: bc828e9d81258c3ba944426803d2d2c40881f2d34d2debd114d6febf4f73257e
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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The PDF structure itself is also flagged for suspicious object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=bacolor+zip+code PDF link annotation
    • https://theshamrockpublecco.it/file/53079090801.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/40302210313.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/vomatusuwotil.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/kikefugowividubuwevoj.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/resafubamavalenelikawuru.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mavipegulofagejepi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc7eed18ea---91025915563.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/fonotakave.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56603919452.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/vomejepigesajofunolidew.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/96753070151.pdfIn PDF document text
    • http://fourfoods.com/images/files/japudiwomotobifirux.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/69651b93148a211dbbeebdc5fe1b4d04/nevagukagi.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109052150047702.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/janoxadifawodixuzipufif.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/konadipogikisugokuf.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/vijivujamereberazalutadi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/27342057842.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207001208f---zexoruxigutarajiv.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/58069100236.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/jasobesowutoxazepusov.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/sizokeminux.pdfIn PDF document text
    • http://aeternoplanning.com/ckfinder/userfiles/files/27768024495.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/20775493845.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/duwanebilozovuzananejene.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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17768 bytes
SHA-256: c67b7deca94d73a102302159dfc17e49c94b6b2fa4e070274fe07a65a174ff6c
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 10248 bytes
SHA-256: 7cf4abdf2b906e306dec99f872c631a8d808b26fb9ac15efb168770bc8d8ea77