Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dff47f9bcb70659…

MALICIOUS

PDF

87.7 KB Created: 2021-03-11 09:12:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cffe13e336e867cb6d7359837e58affd SHA-1: ebe9da160dc174a08a671d1a0f5e34682adbad78 SHA-256: 7dff47f9bcb7065978005048fa48643ce2c7f3f55758360960460c46ebc139ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one primary malicious URL identified. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript, though not fully analyzed, suggests an attempt to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=capitalismo+consciente+pdf+descargar
    • https://lefilima.weebly.com/uploads/1/3/0/7/130775934/wiregagiku.pdf
    • https://pejagefetem.weebly.com/uploads/1/3/0/8/130815482/2faf06.pdf
    • https://wuwusafofe.weebly.com/uploads/1/3/4/6/134619260/rujuxebofanat.pdf
    • https://wininivawad.weebly.com/uploads/1/3/1/4/131483201/kazezumekobetodikaru.pdf
    • https://fowajenen.weebly.com/uploads/1/3/5/3/135329448/garesadujaxekixamat.pdf
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/5204502.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/40fdd59.pdf
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/7630218.pdf
    • https://didiseripipake.weebly.com/uploads/1/3/4/3/134344006/61bf915.pdf
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/bepedododi.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/5586537.pdf
    • https://zamupegokeza.weebly.com/uploads/1/3/1/6/131637483/29ef45044827.pdf
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/95fc137cf11f27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2fa218f3-d63e-448e-9050-873f4920b8c2/transfer_news_for_liverpool_football_club.pdf
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_b48ba1faea4a4a4b8f308260017d05a9.pdf?index=true
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_5afd2e6362ad4594b8f3c0975c73c7ca.pdf?index=true
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_0d70fbcc092a40d5a4eff20d3a8f6f45.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf801a29-299e-4fd6-8eee-b3b0b8ce284c/jowitanofigokalejal.pdf
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_a759e931a4944cec8ef9ce8369a394e2.pdf?index=true
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_ac76615e10cb4b66bae2981cf5747f60.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cf7a2b84-0f1a-4fb2-954d-c8cb089aa371/61040373226.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_off000115f5.bin
e948666f1a8d2b6eeca86a8f6f1be47efe1f76b53388f84b32128f507e66d410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 5380 bytes
font_01_sfnt_off00012825.bin
e5f896e970b4131b545cd10524dde850cd36098d1e3391972662a72053b617cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 12296 bytes

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