Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fdb89885500539…

MALICIOUS

PDF

85.0 KB Created: 2020-12-27 23:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a16d51cdbbc099dce8c0290497382a50 SHA-1: 72eee6cf7f50658a25bb0f62dad0eed86089132a SHA-256: 85fdb89885500539c3207b2d5059797f99a24821555f9bcfeee196e7f4dd74e2
214 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous links to other PDFs, disguised as movie download links. One of the primary links, 'https://traffmen.ru/123?utm_term=malayalam+movie+my+boss+download', is flagged as a malicious redirector. This indicates a phishing or malicious content distribution attempt, likely delivered via spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=malayalam+movie+my+boss+download In PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/198c460007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5f9870c8cdd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fb40b394080e.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/605566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f9f585be0a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426421/normal_5fc19cd53b720.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fca51e50312e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424647/normal_5fcba16b88b4a.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/turip/18467651442.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/3280847668.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/lewatonerakepebugajoje.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/69125245406.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/lozajuwifiwinabafapovife.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_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 5272 bytes
SHA-256: e1b7371411b2d2184e5173261f0257c3e74ea5690cb4707dcb7d5fddae907d17
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 11896 bytes
SHA-256: f3e41a27a02027bfe0a13d9e23117f728fe07141d5f7bb312338b3fc6bb1b9fc
font_02_sfnt_off00013245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13245 16088 bytes
SHA-256: ccd0ea095085b9379100d4de0d13d045157d8501f46cd3db2ef5c00475687e02

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