Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a197a5ea408c0ca…

MALICIOUS

PDF

73.8 KB Created: 2020-12-31 19:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e62bc333e2f617c2fff2398f134742f SHA-1: 80777b9c4fbe5c19eec5762b36f3d1d38bb1e55d SHA-256: 2a197a5ea408c0caa581891b0deddb8a2c22b2fd29fc9cc024d9490e253d462d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and known redirector infrastructure. This suggests the document is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=university+club+san+diego+parking In PDF document text
    • https://xipejefokodidub.weebly.com/uploads/1/3/4/6/134612454/5174745.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/xileteb-filimomixogolag-goguvigadixi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5fa5913445952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5f8d43001b008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_5fc0af6fdb5a8.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/soduwine.pdfIn PDF document text
    • https://gazumewus.weebly.com/uploads/1/3/4/9/134901575/4562792.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384831/normal_5fedd25fd18ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377115/normal_5f9f6647f1a22.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/nidekikoboxaliture.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/413c307b-f3cb-4369-8aff-c6e5e84400b2/risew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa22fd4-5adb-4afb-864f-87d53d335d8b/9605168920.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 5600 bytes
SHA-256: efb7a8c151a50682e9a8e6ce7c9ae0031ee45726a5b1c9fa252e35cc0992242a
font_01_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 10596 bytes
SHA-256: 1c5895e2a61a131f4830f391d5418aa63d03e7beb5a182e89d2bc8569c53accc

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