Malicious PDF — malware analysis report

Static analysis result for SHA-256 d420f982f5d0135e…

MALICIOUS

PDF

77.7 KB Created: 2020-12-22 17:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c33b82a9e721f2694681ccc4d156f744 SHA-1: b79418060ce0251d6796b6b6bff06a5abdc0a232 SHA-256: d420f982f5d0135ee6099d375a01cbece33bde04aa54b3b1c3a52158aa3e5e13
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and the presence of numerous external URLs point towards a phishing or SEO spam campaign.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/strik?utm_term=teleportation+superpower+names PDF link annotation
    • https://zutijuxugovoxi.weebly.com/uploads/1/3/4/6/134684331/sukodujewexaba-vuwog-fivamoxevuginoj.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/subipu-fipebapojewut-nunibobala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_5fbf21ce90299.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tutasujal/parawuvajazopepunelurewol.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/sans_cyber_security_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/lagu_cherry_blossom_ending_ilkpop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04baaeb3-a7db-4f73-a489-518d4553939c/48271303406.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/78929877100.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/action_words_worksheet_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/jurubupabimowedevawivo.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/biodata_for_marriage_format_for_girl.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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 5004 bytes
SHA-256: a1747c5d91b191ab2e1bc19bbb3a0de8031a4eeedf6feb7c682416ebdb1063aa
font_01_sfnt_off00010680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10680 10624 bytes
SHA-256: d190a8b3e2e698669a171b877091360a31811e638d7e37260ba535693da6bcfe

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