Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc30c72938a6eaee…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 15:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2f81155ccfa7af11e270cb5b3ccc13b SHA-1: 8e1d342b2cc737b91e3daf0d0d6cf205a3259a8f SHA-256: bc30c72938a6eaee685e9cafab8653ee6fa76390925b0c549cceeee6510551eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple embedded URLs point to various PDF files hosted on distinct domains, suggesting a coordinated effort to distribute content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jamxmpharmatech.com/upload/files/fowoxepofopugisup.pdf In PDF document text
    • https://sanghvicranes.com/staging/media/zifirarinokew.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/79905963301.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lawedopubon.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132eb6facda5---kabiluvegozuwez.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/sifurulonixezus.pdfIn PDF document text
    • https://preciseenergygroup.com/media/9270063717.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///zununodopafagividu.pdfIn PDF document text
    • http://sireny.net/share/files/30792724580.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/42297322923.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/vizowega.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/98926864069.pdfIn PDF document text
    • http://topp.pl/_topp/file/1917137184.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/vikanitukijisemugumukuleg.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/37917395851.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/rasewaxozelixorepabopik.pdfIn PDF document text
    • https://combrooncom.com/contents/files/52805964151.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/wirenejogivezipanujetamox.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/26247112068.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/2258606290.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikivadalukotomolopil.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0b847247c78e6ba95a28f8551f72a130/18933243546.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/32485050565.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/83798016482.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/volepojubawugen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=gamegully+pro+apk+download+uptodownPDF 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_off0000b248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB248 17612 bytes
SHA-256: 219a951cca0aae51036719815c8a4a6155f00a727de8ba2a99d56541287cd025
font_01_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 10908 bytes
SHA-256: 5b65ef4a7ec36efaa2d8df2daf9b85771f3cfe373284f685cc3e4cf803a24eec
font_02_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1