Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdef9ee4baa1076…

MALICIOUS

PDF

76.6 KB Created: 2021-01-08 07:33:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dcc04fc8a8c49573720d8ede525f4ebc SHA-1: 91bf4c9b39f697714dd012711ab40c1cd9eabeac SHA-256: 8fdef9ee4baa10768fce784ff798ebd49872584cf35b908b860cb20757c43fbc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, with one prominent example being 'https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/832a59db9c8.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/aws?utm_term=small+pdf++desktop PDF link annotation
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/832a59db9c8.pdfIn PDF document text
    • https://lupigufenof.weebly.com/uploads/1/3/4/5/134509144/jakoxoxavef_birejumebopeto.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/ZR5VK3Z/osmo_mindracers_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/supibufuk/hijhgja/76756234895.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/m5ijhim/get_dragon_scroll_skyrim.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/f23a1ac1-e0ed-449a-a314-7192ec1e5351/bakujubematonupudoxapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17dd4fc-b270-4618-8436-bf5ae12a7e3a/virumizureguwodosegijo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fe8c03-81e3-4caa-9d5d-7116ea6ee64f/constructivist_theory_of_sla_focus_on_skill_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8ad00f-567f-4e48-93ce-cf0bcd65e8a2/42518809561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2cac5b1-babd-4cf7-ae97-6d3d76564174/chakra_frequencies_tantra_of_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9759ce-8564-46fd-94df-ff97445266c1/runenimikipudatadiwanive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a2b055-4fde-4aab-9e49-8cf44e28449c/26633729208.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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 5260 bytes
SHA-256: 2d18a4ffb5e9f4ab520cd571a36caf005595779e1955cd2746833fb44dc51541
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 10396 bytes
SHA-256: 58e4959e5a14c16c41dea91b174c7a9c63aabba452634f6a8d4d18d441000e9d

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