Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a0a9850919a9fa…

MALICIOUS

PDF

77.0 KB Created: 2021-01-18 17:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4688cb59e41c50818ee9ac92c03febc0 SHA-1: 3d643818b40ac406a075a5a5a57d96a9cf003b51 SHA-256: c0a0a9850919a9fa85aa76f76286680974193ed8aa833a629b9d24dbfb56dbd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious content, likely a phishing or trojan payload. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/aws?utm_term=definition+budgeted+cost+of+work+performed PDF link annotation
    • http://dutuvowori.22web.org/as_level_physics_kinematics_worksheet.pdfIn PDF document text
    • https://wufanamokedig.weebly.com/uploads/1/3/5/3/135326106/3691177.pdfIn PDF document text
    • https://cdn.sqhk.co/lofakekaf/ciijcig/pro_pinball_fantastic_journey.pdfIn PDF document text
    • https://dalowosa.weebly.com/uploads/1/3/4/3/134383453/winawurugabiga.pdfIn PDF document text
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/8345367.pdfIn PDF document text
    • https://pafazemewo.weebly.com/uploads/1/3/4/5/134517711/taxurezuteleze_tolawibobar.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/idhhEB1/redasezolofori.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/EhjygjP/xotobolisotifajuturodizem.pdfIn PDF document text
    • http://nufogikije.22web.org/mozilla_firefox_52_esr_for_mac.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/zapidenodiba.pdfIn PDF document text
    • https://cdn.sqhk.co/segenapiza/hxkzjcz/mc_server_connector.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefabe/ielts_book_7_listening_test_1_answers.pdfIn PDF document text
    • http://wetedezowob.rf.gd/acls_stroke_protocol.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/high_density_lipoprotein_cholesterol.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/wegavexokujovevo.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/wemepedaditidokiposobul.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/27310197126.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/mario_kart_tour_upgrade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/5416354549.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5528 bytes
SHA-256: 1a4638cd26b2064b0ed0d2dae96f726bb00a0e07800479d32bc92268b85da57b
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 10572 bytes
SHA-256: d7d3dfbed9460cd6a55c2d267060a48c7e1058f32c720577b1ca094f87b3dcba

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