Malicious PDF — malware analysis report

Static analysis result for SHA-256 5784be3a6a85fb17…

MALICIOUS

PDF

73.3 KB Created: 2020-12-22 07:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7c95ecc10e0657456199cf45e99f598 SHA-1: 1125c4c19648028aff68c9e30ed50d66465081ca SHA-256: 5784be3a6a85fb172ffc34ec0fd663ef308d735a9d048083a34b64e77b28eeaf
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=2003+nissan+altima+3.5+se+0-60
    • https://porijupipisezug.weebly.com/uploads/1/3/4/7/134718457/349098.pdf
    • https://wafebunutixiwi.weebly.com/uploads/1/3/4/1/134109037/6011304.pdf
    • https://saxesejidor.weebly.com/uploads/1/3/4/6/134694827/mimosami_repunovem_noxubowujuwaw.pdf
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/481f1e9379.pdf
    • https://zisefedid.weebly.com/uploads/1/3/4/7/134767142/5530e.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5fa942aa67745.pdf
    • https://cdn-cms.f-static.net/uploads/4505096/normal_5fb2de61997a8.pdf
    • https://giruveme.weebly.com/uploads/1/3/4/4/134480937/lubaloto.pdf
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/suvuvariguzojulu.pdf
    • https://suleduzon.weebly.com/uploads/1/3/4/4/134403341/8792242.pdf
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/segopema.pdf
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/9469460.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sagotomagin/biostar_ta970xe_manual.pdf
    • https://uploads.strikinglycdn.com/files/277bd0a2-e52f-4bb3-b36b-dacd754608fd/zuritotufejufovon.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b2.bin
0d59c2b3bd2751059bf848c5351586c480284d27e953cf4cfbe8f900f45e0a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 5420 bytes
font_01_sfnt_off0000f317.bin
1d5e33db9a72f31a8080a150f5a7dfe0efc05648ec5ca10783f45f6340e1f338		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10964 bytes

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