Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc020ca6aef1f6d…

MALICIOUS

PDF

72.1 KB Created: 2021-10-02 11:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a4f0063b784c88958af87cbe5ef5fd9 SHA-1: fed6f451e9a6a3a68166db01fdbbbb525f16e671 SHA-256: 0bc020ca6aef1f6dc255c16ba403f799d6d21de2b0175de500fd5876ffdd133d
146 Risk Score

Malware Insights

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

The file is a PDF that exhibits characteristics of a phishing lure, specifically a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs pointing to potentially malicious or disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=pdf+of+database+management+system+by+korth PDF link annotation
    • http://misterholidaysanprisco.it/userfiles/files/mapup.pdfIn PDF document text
    • https://777mto.com/contents/files/16419078521.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/folofawikolopitowovi.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/73101345475.pdfIn PDF document text
    • http://quetthe.com/upload/files/49653322732.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d800ea46---gufivetovoni.pdfIn PDF document text
    • https://stotex.rs/files/nitejifokabadugavakikukuk.pdfIn PDF document text
    • http://csp.hu/editor_up/buziwemavudavamoxegopegax.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/zadiziluzazusuraseza.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/wipotozezutamaronowi.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/bivexu.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/bositarikowedi.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/85879358116.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/25434977779.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/56041292855.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/ralejobaxeza.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/tugurijubesinumi.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d3b36bb3b---13083014783.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/70637082965.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/fevefenofomawavonoj.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kowesovi.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/rutotowutupulifa.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/64844914732.pdfIn PDF document text
    • https://tmtteks.com/files/kefipimovidanimonurifa.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/89121148649.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80274646627.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_off0000b574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB574 11012 bytes
SHA-256: 19b25ec64f6104d673f391d6b206aa22d4742a01f74d5d2779444019ffb20c24
font_01_sfnt_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 16432 bytes
SHA-256: 4c5c3b26b14308b7a3560af047d1b03c604f97c61d463935c858f2cddcd4f011
font_02_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1