Malicious PDF — malware analysis report

Static analysis result for SHA-256 05148ea4faee4275…

MALICIOUS

PDF

71.0 KB Created: 2020-11-26 15:31:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6c2fae2cfc021ead8a15269dde4659da SHA-1: 237a59513fe887808a434314d0b9b77ae38fd673 SHA-256: 05148ea4faee42759b61966313e76eb749b22184cb4605883e659f4c0d8d3ccc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The primary URL identified, https://gettraff.ru/strik?utm_term=chastain+middle+school, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and the malicious URL strongly suggest an attempt to lure the user to a harmful site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/strik?utm_term=chastain+middle+school In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_5fb6cb32999de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459329/normal_5fa9e426e74c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fa045ea217e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_5fabaf0b4a277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_5faed408c4c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8e51ab2877a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_5fbefeecaffb5.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/8c5b1157-3d3d-4b54-8324-cd4cc6830ec3/examen_tercer_bimestre_quinto_grado_lainitas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f8b449-047b-4f0b-ad13-c9f1a26ce729/64459166011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d55ebf8-19ce-47a9-a11f-287cd6cb8b37/28741168105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85cad10f-1f01-4163-be17-33816ac576e7/sonuxinelufadasipoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2592dc65-0361-4262-b106-47ef9c0f2051/50950356198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abde8f55-6d4e-491d-a446-95176b73f422/mbta_commuter_rail_greenbush_line_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/459e37fc-923b-4746-92cf-d1d30ed7c462/zadumizag.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 4988 bytes
SHA-256: a1578099150c5515928ebacca892cd912d0227de0cfe9e4e63cd360b947e245e
font_01_sfnt_off0000d88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88B 9724 bytes
SHA-256: b063d72d3dbdaa42244958d0f34024e08b7975db573445acf21f281f198ab8b2
font_02_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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