Malicious PDF — malware analysis report

Static analysis result for SHA-256 a521c4b1086351b0…

MALICIOUS

PDF

112.6 KB Created: 2020-12-25 22:27:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 11b2d1ce7c79bf502cabc43df17c6ddf SHA-1: e04d558fd96f232e1c4323c33be7d161bee7aac8 SHA-256: a521c4b1086351b0a44fc0acb13e0fb55d458d6a2b6fef37d30a54033a403e64
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/strik?utm_term=affirmative+action+in+education+in+kenya In PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/e2835443d6d6f5.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/g7xDggU/breadwinner_definition_sentence.pdfIn PDF document text
    • https://pakilimog.weebly.com/uploads/1/3/4/3/134363837/nezowafadu_notufesabuvizab.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/aa0e17e6-5ee8-4032-851f-bf6d4e34409a/lemokapubitokitave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4f2c47-7cf6-4b92-8d0b-b0fd9aa45187/79573498354.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb701aea-306d-4a8f-b3dc-673622bfa12b/81582073416.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcc471a-f04f-4a2f-a3f0-16b6e6cc86e9/reparacion_de_aire_acondicionado_portatil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745b5b34-3b10-43a9-ad9e-02b4b6d54292/1461914451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/633cb770-53f3-40c2-b0f7-3121e4291baf/tezesifup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c18d49-bcff-4718-a4fe-aa7e96b62e97/suwannee_high_school_football.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0573f7bc-8832-43f3-bce8-42044c65dba0/55054634602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25af8f5-c6a7-427c-894a-d7a6661731ba/39334195834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428a6c6a-7cf9-4620-8d58-bf37b549e4b8/58074071080.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_off00017d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D47 5172 bytes
SHA-256: cec33d36c26e39d2bd8961d16713cbf93cc3438e3f7e90c630bd7730b259c5cf
font_01_sfnt_off00018edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDB 11504 bytes
SHA-256: 5db1bfcf686da161e42dab1412b7c54ccba31a8449af8f3dab12f2d72039e309

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