Malicious PDF — malware analysis report

Static analysis result for SHA-256 251370756fd62dbb…

MALICIOUS

PDF

79.1 KB Created: 2021-05-25 21:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 630707327615ca844a1e7f42251e120b SHA-1: 30bd46f8617bcd8f1d2cdd7d269352efad491828 SHA-256: 251370756fd62dbb970d5553e479af5f164867692fd5ff3715ff068c2aed8668
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the presence of a large number of external links, with the primary malicious URL being dugedepap.ru. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://dugedepap.ru/strik?utm_term=breusch-godfrey+test+interpretation+in+r PDF link annotation
    • https://pagevexositikul.weebly.com/uploads/1/3/5/3/135327712/7827115.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/af8412f88eff.pdfIn PDF document text
    • https://melijavunibujov.weebly.com/uploads/1/3/0/8/130873932/dunawid.pdfIn PDF document text
    • https://boralixaki.weebly.com/uploads/1/3/4/4/134479476/xerituwobedesi-magitav-fogimojig-merute.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/resisuna/rebabaropafiduxoxufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c52561c-4325-4729-9d6e-502de37a5813/wagipiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a589f15a-21fe-401b-9f6f-1aa60d133a42/cooking_merit_badge_workbook_answers_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/vehicle_bill_of_sale_form_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e831020d-571b-4d20-9b90-c959e2b02a69/pride_and_prejudice_and_zombies_2016_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/9870626073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a430b9-ec82-425d-9807-14976fb5c0ff/forged_in_fire_show_netflix.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/49286000680.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/employee_accident_report_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/nafunavijemetofe.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/earned_value_management_reporting_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71eb067-9b47-4db5-91bc-1f65d501d932/pugokaxubefita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5efcdf0-49d6-4eab-8b62-6d523097219c/gizegekuvufolulewi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 5452 bytes
SHA-256: 5eb5ab441b5d1805eb7dbb5c9d13e14c314d727376b9f85a3017c5241b73e99d
font_01_sfnt_off0000f85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85A 11768 bytes
SHA-256: eaedc8558f9162293241cbf5ca01a11c225b3182e960ae54e9b1975782e326b3
font_02_sfnt_off000120b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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