Malicious PDF — malware analysis report

Static analysis result for SHA-256 3153b9e7f8b50fc8…

MALICIOUS

PDF

69.4 KB Created: 2020-12-11 09:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3923608791962b61ecdc8fd78903d932 SHA-1: efe5da51ff53a2f0556c06ed775ec9825ae2ffa8 SHA-256: 3153b9e7f8b50fc8fb505010fff4acfe35e12c7ff5b8894f1b4a72571434b2ca
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, suggesting it functions as a link farm designed to direct users to potentially harmful sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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/aws?utm_term=natasha+bedingfield+unwritten+song In PDF document text
    • https://wubobuxidozexe.weebly.com/uploads/1/3/4/3/134322977/f334a.pdfIn PDF document text
    • https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/bivapinoj.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/kigedaxuw.pdfIn PDF document text
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/d7991feea1f85d.pdfIn PDF document text
    • https://nipifofopofeduv.weebly.com/uploads/1/3/4/3/134338269/merusisosegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5fb5555231b06.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/wirewukug-welilunew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2663c18-9fd4-402c-b3d8-63edef1b6860/xononibonugawanaxukuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30657b0f-773e-4998-8305-2f34f5745fa2/dokakijoja.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/buxidipalolamu.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/68234624785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7abc43f6-fc27-4d85-9456-be11dd741b73/marruecos_mapa_tanger_del.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 5372 bytes
SHA-256: 3d6f871305bf219149c6cb9b4f593c86e5afb473b82d00d7ebd17d8a202f7029
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 11112 bytes
SHA-256: 33ef0b7638a819367f6332f2554984670939509c48e7f854c9db913ab9c68ac3

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