Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8541c4c0ed2529…

MALICIOUS

PDF

74.4 KB Created: 2021-02-22 16:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6527d5151b5f44acc75b7dd163b53b7e SHA-1: 1db9cf7175d49f27db5a366582bc41f9b8c826dd SHA-256: 4f8541c4c0ed252999acfa989c64354348dbae41b36f6eb6a688476cdde0ef2f
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 of which point to disposable hosting services and known malicious redirectors. This behavior is indicative of a link farm designed to distribute malware or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

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://yafferge.ru/123?utm_term=why+does+my+polaris+hose+gets+tangled In PDF document text
    • https://tojejalunegod.weebly.com/uploads/1/3/2/7/132710717/fimagoxis.pdfIn PDF document text
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/pelasebigelosalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479454/normal_602805202fa78.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/eikib0F/spinal_cord_injury_awareness_month.pdfIn PDF document text
    • http://ita-yog.space/yamaha_rx-v673_wifiz56i8.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/dAjgfY4/santorini_deland_gluten_free_menu.pdfIn PDF document text
    • https://wedikeme.weebly.com/uploads/1/3/1/6/131606111/890c7.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/facebook_data_analytics_toolsugl0e.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/4460a6100.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/6717467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fd290a9e8c05.pdfIn PDF document text
    • http://setlyb.online/cbse_guidelines_for_class_12iy6ln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rirusozo/azure_devops_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 5276 bytes
SHA-256: 826b592cb64ad421942ebf13bd83954f265b1200fd4a626cd4ee1c3a1630cdde
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10316 bytes
SHA-256: 3329e55af945b7a127bd5477573d4db66a41848f02ebccdbd3ea11dee659b316
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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