Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dee1ff7012d720c…

MALICIOUS

PDF

88.7 KB Created: 2021-02-20 04:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a53117782683a150533543f4e46c540a SHA-1: 765fd9d8ba90d3975f2f244bf030ca41fb216e09 SHA-256: 8dee1ff7012d720cb232ce1167e49e17cf5a2b9750af92fc6a424908459edb24
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs, indicating a link farm for SEO manipulation. One of the primary URLs, https://seumenha.ru/strik, is associated with malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=interview+questions+and+answers+in+html+and+css PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417988/normal_60018825f11c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fd16f904ef78.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/4149892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_6019b9db7fba9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5fcbb03f12e81.pdfIn PDF document text
    • https://bituxomixa.weebly.com/uploads/1/3/4/1/134131270/822efea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5fd8883544132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fdc0de84f311.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369504/normal_600102d196ec3.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/pegebunov/57786415504.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/acknowledgement_sample_for_field_report.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/vejijizo.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/61900921259.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/automatic_transmission_vs_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/awadhesh_premi_dj_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/satidenalixutivarufalota.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 5392 bytes
SHA-256: ec2fd2e9bc99c61592fdddff31401ead9108ed6543b3351fd17c1992908645d1
font_01_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 11548 bytes
SHA-256: caa3b385c869e4b244a34f8d4fc5f5354a3e07f65f30c73932f8c51e5ebc3457
font_02_sfnt_off00013d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D86 16804 bytes
SHA-256: d707e900e9647a944cf2e6c8f62bd424f3188c109c3dc31dc14ea1f7667bde0c

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