Malicious PDF — malware analysis report

Static analysis result for SHA-256 b824228965ad17fb…

MALICIOUS

PDF

94.7 KB Created: 2020-11-25 19:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2d19889038e5eb9d23c17e24eaeba25 SHA-1: 849f049201db58e1bb138678157405628b42defe SHA-256: b824228965ad17fb97f2491e3a84983ac4546f25a83701a3e7b69ff54659b41b
214 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and a machine learning classifier. It contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The PDF also exhibits characteristics of a link farm, suggesting a potential SEO manipulation or phishing campaign. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of its specific intent.

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://ggtraff.ru/123?utm_term=wyrick+steps+to+writing+well+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5fbab0775cade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495974/normal_5fb9a7a7b2011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402507/normal_5f96521c72f62.pdfIn PDF document text
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/2606281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f8e29dfcd12b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f8b4b570299b.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/d056d0efba8.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/2d48734f-8a91-414e-9a5a-8bb23f78643e/roboximokezumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee6984a-7442-4a17-97ec-69c49087417e/najavuxegepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abd7a3a-eea4-4b18-b882-37914bccacdd/intimate_apparel_play_full_text.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/92188053715.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/arris_tm822g_speed.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_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 5384 bytes
SHA-256: 1fa8f956086c1231d502501203c7d88de79622d9426e862139592e87e572041b
font_01_sfnt_off000148b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B7 10948 bytes
SHA-256: 8fec91b7d72060416e018ca56a935ac359ffe391a351e3ad95c7de401762718a

Open this report in the interactive analyzer, or submit your own file for analysis.