Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d02e191ecd68df…

MALICIOUS

PDF

77.5 KB Created: 2020-12-21 20:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0c11dc0b783baeb43be7ca9c9c2b2a0b SHA-1: c0d5ba95edc55b7f84a0e7e939cb18d4798b22fc SHA-256: 91d02e191ecd68dfeee93b61d8bec0e80ec33bb7243d14fe197110d3ee63b6a8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, suggests a lure related to 'stars in the solar system'. The ML classifier and ClamAV detection strongly support the malicious verdict. No scripts were extracted, but the presence of a malicious URL is a high-priority indicator.

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://cctraff.ru/strik?utm_term=stars+in+the+solar+system+names In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fc166351f4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fad6f9a47477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fb2624c26901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_5fd3d557b0dd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_5fd993828c6d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f98be6b4d83a.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/50777f2c-024c-4e41-9127-93e75cb64a94/ronimapuguvibitafip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32a1640-d62c-40f7-b80f-e60dceb1f863/46735671955.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/34613021578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e885daf-0ea4-4c54-a167-caef5f1ca804/sapuvogisuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feea5cba-d316-4923-913b-bd77c254f9c2/2005_suzuki_boulevard_c90_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10a6fbd0-7335-45dd-8e7e-44e1d103454f/a_raisin_in_the_sun_questions_act_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6135ad3c-8402-432a-bd40-b4bdab7674fe/trainz_simulator_thomas_and_friends_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/emirates_damaged_baggage_report.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/57192587019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6cbf0b4-e44e-4341-872f-c1af3718424b/tagomefedokozerobetolam.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5128 bytes
SHA-256: fd587d75be1d3916a6258036af91df486d092be4aacdf2cc26aa3ef71c77b99f
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10564 bytes
SHA-256: 28ce19ebaf10ee3f3067c95c51477fb1f93ecc2797bfed2626f98d014863d887

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