Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c8cf85a51bfeb8…

MALICIOUS

PDF

65.6 KB Created: 2021-01-05 22:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3211f27d9c0b8f266ebb70a3df60e39b SHA-1: ef84ed3a3cebdc5a14d67e9ed653a5ff97995eb2 SHA-256: 55c8cf85a51bfeb89b685aca5480c07cea0a620999175a351831d352333fc601
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which are disposable or associated with redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, potentially leading to exploitation or credential harvesting.

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://gettraff.ru/aws?utm_term=shirley+carvalhaes+esse+adorador+playback In PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/3519357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5ff29eb830b97.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/327135d4e713e.pdfIn PDF document text
    • https://xujurewe.weebly.com/uploads/1/3/4/8/134865393/5686267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_5fd3dd789b054.pdfIn PDF document text
    • https://sumigixutaruxaj.weebly.com/uploads/1/3/4/7/134748626/vujapawidib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fb7772d2757b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f8c262c0cbeb.pdfIn PDF document text
    • https://vunakeba.weebly.com/uploads/1/3/4/6/134623580/pizato_sorigu_salixoda_lukagivokenunix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415937/normal_5fc3d2a83ba8a.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/57512825-65c4-4f20-93b3-964b328aeb6f/57642814383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af613a37-3de7-4e99-95a6-2f6a5e641931/breville_800esxl_manual.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_off0000c2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AA 5632 bytes
SHA-256: c27204dae9b4397262688efe1c1552018bd873b1d2fd4f85f43d91b85338f08c
font_01_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 10476 bytes
SHA-256: ec18daeff981d4353d2e7dd51a29ad0b8deecb1ae29e1169012950c5ed4c737a

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