Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcffc6f999b00ce1…

MALICIOUS

PDF

67.0 KB Created: 2020-11-24 03:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f210d6b07bfdd0cfea1d9692fa6a7958 SHA-1: 194fb2ebecda474a5b279433eb83403b978b025c SHA-256: fcffc6f999b00ce14dea977e838bf62913e05208a61412041fb8f97a9ce3b89a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and a high ML score, indicating malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to various PDF hosting sites, likely to obscure the ultimate destination or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/123?utm_term=eastern+york+high+school
    • https://gigewabiwijezu.weebly.com/uploads/1/3/4/5/134576475/cb87d0648b5.pdf
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/3553507.pdf
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/kopiwebakubalu_mejewol_tozujamarawuri_baxexonilosa.pdf
    • https://cdn-cms.f-static.net/uploads/4375708/normal_5f9cdc7b108e8.pdf
    • https://cdn-cms.f-static.net/uploads/4384155/normal_5fa9368f33e57.pdf
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/d168944e22ef23b.pdf
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/5aad4f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/131ebdd2-41a9-46a5-af3c-83a0153c33a2/kuwupub.pdf
    • https://uploads.strikinglycdn.com/files/7f3aa4a1-a98b-4a50-832d-09a63d3af54b/nifitidorububidolamisu.pdf
    • https://uploads.strikinglycdn.com/files/d626f07a-a7b1-475c-bba3-c25ce417ed26/47510899172.pdf
    • https://uploads.strikinglycdn.com/files/8f5c737a-c191-49d1-8ee1-439f494e8210/33580200325.pdf
    • https://uploads.strikinglycdn.com/files/4a11b2d9-37ad-4638-bc67-50e3cc97c9a3/on_course_7th_edition.pdf
    • https://uploads.strikinglycdn.com/files/4a81f3d0-3c48-4195-a661-ec8169997763/livre_pour_apprendre_le_francais_pou.pdf
    • https://uploads.strikinglycdn.com/files/7dc7a28d-a655-4362-80d2-8b7b3249cdb2/masuto.pdf
    • https://uploads.strikinglycdn.com/files/cc18f9c0-bc49-4301-9d9e-86c67a5bf83d/the_chronicles_of_exandria_the_mighty_nein.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9ce.bin
d914cd15bde8c1d90114bf382774c09a9f373d264b513c29814422eb1e91902a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 5184 bytes
font_01_sfnt_off0000db7e.bin
2acaddcb6be0e46296fb9e2bf01fb1b1242da17e2d66022d3c1ad2a30e166278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10452 bytes

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