Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ba3f18c8d2f7db…

MALICIOUS

PDF

75.4 KB Created: 2021-01-05 05:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8039ca11dc0190b97fc970b9aafe75ac SHA-1: e775a8cf6431f7c67341b1a9d30c3a1d94666d7b SHA-256: 20ba3f18c8d2f7dba78ba7674bb1bb6989dcbbb2a786101bee4d5accea0524d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or used for SEO manipulation, potentially leading to phishing sites. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of malicious activity, possibly involving embedded JavaScript for redirection or exploit execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/aws?utm_term=addressing+modes+in+8086+microprocessor+pdf PDF link annotation
    • https://cdn.sqhk.co/moviferu/0vYjbje/prisma_photo_editor_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/ifIggFZ/descargar_geometry_wars_3_para_android.pdfIn PDF document text
    • https://cdn.sqhk.co/duzupafuj/jbifSV2/icorrect_take_ielts_speaking_test_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/hDRD3if/jugedanowebemowemalaxaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/ggfOldw/61742352658.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/veboruka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/forward_rate_agreement.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/dixajaxuvebiwep.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/48436994038.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/brzezinski_between_two_ages.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/21352233877.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/fisaxomagem.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 5420 bytes
SHA-256: 5464d85492ba700102393d227396bdddf865f3b5d06ceed49d718f72dafdf9dc
font_01_sfnt_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 10932 bytes
SHA-256: 03d10760835a8d0b7c6572f62c6ba7adc1e0a09ee318d3a35130e039d9f3351e
font_02_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 16088 bytes
SHA-256: c487aa01613208473e3c0b892de3260687b9c0341624d6c76d95d7849508583e
font_03_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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