Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1eeb78ab6810c94…

MALICIOUS

PDF

75.0 KB Created: 2021-01-15 05:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 04e297664067b97b731890c2958aacff SHA-1: 9bf4ecae6f7d9bc6147e58ea46d9694d3086e311 SHA-256: f1eeb78ab6810c943fbc582abf8664cdee4e86210281164ba7e100c61d93c306
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector services, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=countertops+home+depot In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386848/normal_5fcd10a256465.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/7e3bbe9.pdfIn PDF document text
    • https://site-1168267.mozfiles.com/files/1168267/rujoguzomiwazata.pdfIn PDF document text
    • https://zetapowopes.weebly.com/uploads/1/3/0/8/130813904/nizaludavus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f9d1ead2d838.pdfIn PDF document text
    • https://site-1168164.mozfiles.com/files/1168164/desert_island_fishing_mod_apk.pdfIn PDF document text
    • https://nirulutot.weebly.com/uploads/1/3/4/7/134700174/71514c.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/pelavugadonife_terojusuxunez_budesenizexagax_gusodume.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/moxukekudi.pdfIn PDF document text
    • https://vijaraxuvebuko.weebly.com/uploads/1/3/4/8/134895366/4791344.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/wekibik/38063018909.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/xabomalikaku.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_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 4860 bytes
SHA-256: 7c360a7be14e28ec371c887d0937e413c298d11f8cb7ca82d4072c37e7708c9e
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 10464 bytes
SHA-256: 24f1b2d3f5610132a45eeb8d62c4bf8c54d6266c5fdf1a3ba5a15e90eb799e09

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