Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e6bcd979cf214b…

MALICIOUS

PDF

64.3 KB Created: 2020-12-24 01:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: dafa02c2c51e3c2ccb641e226965bafd SHA-1: 5dbb142be1c051b158be92937a576cad905735b0 SHA-256: 28e6bcd979cf214b3e26b23f5ac66cff1f206ed7f1c446141efa18ce9888e5e5
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded links, suggesting an attempt to manipulate search engine results or direct users to phishing sites. While no scripts were explicitly extracted, the presence of numerous external links and the ClamAV detection strongly indicate a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/strik?utm_term=electronic+projects+for+students In PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/vinugixizun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477658/normal_5fdb92f99f7aa.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/9e4e5d8f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5fb416e877277.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/timopixibijog_sumobugilupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fb2673d2014b.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/e357be61-17b9-485f-ba01-41b7e1df07f8/26278628269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de359ceb-8b6f-42e2-bdf9-cc2e45a8ab47/bonapuforik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc44196d-4067-4736-9942-d58d3edacaca/40823920217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a700954-fab7-4115-831c-45576b3b269e/visonizaze.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_off0000bfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFED 4972 bytes
SHA-256: 8b521590d5ef9e1ba65ff724fea20b54008e57ac67ac3a62443dcf281e4bcc74
font_01_sfnt_off0000d0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F4 10536 bytes
SHA-256: fb521aa3ca2769f817a83c5811265ae7b7962100954080cb0f13a36b7b80d36c

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