Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9b66840ef25523…

MALICIOUS

PDF

78.6 KB Created: 2021-03-14 14:50:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8d3fa1e7804a6e6595d75b3e905451f SHA-1: 89b207d330aaa5034593a6d75034c96ef56bb24d SHA-256: ca9b66840ef25523bf1c4913179c0b634e9258fd6986ca55e11fc5cdcb76e195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are to other PDF files, indicating a link farm. One of the primary URLs, 'https://resalured.ru/wix?keyword=grass+carl+sandburg', is likely used to direct users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing or malware distribution campaign.

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/wix?keyword=grass+carl+sandburg
    • https://cdn-cms.f-static.net/uploads/4457881/normal_602f878f64cc2.pdf
    • https://wujabadatudipox.weebly.com/uploads/1/3/5/4/135400083/ad2721f4adf03a.pdf
    • https://static.s123-cdn-static.com/uploads/4381980/normal_5fcfade0ec859.pdf
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/mulobefi.pdf
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5fdf8fa81e97e.pdf
    • https://kisewosa.weebly.com/uploads/1/3/1/0/131070890/8680d806d3a9e.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/3307215db.pdf
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/a75dd95ff.pdf
    • https://cdn.sqhk.co/duzemata/cxqjgja/samutidatudesunotofawu.pdf
    • https://cdn.sqhk.co/jotoselu/jijdYgf/72740775653.pdf
    • https://static.s123-cdn-static.com/uploads/4410211/normal_5feebc951fb8c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e4b53ddd-11ec-40bd-a03b-ca2cf348154d/kumos.pdf
    • https://uploads.strikinglycdn.com/files/2903ef5d-16c4-4f32-a887-4ca223fa33c9/pitemewatovogodiwosi.pdf
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_ce236ab771e242378531eaaae1f469a6.pdf?index=true
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_6eacb3f683be43299dc6bd4d04993bcc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae8bb46c-1ea0-4eb8-98e4-fe1d038ea9a4/home_ac_repair_diy.pdf
    • https://s3.amazonaws.com/winumigutam/how_do_you_reset_a_ge_dehumidifier.pdf
    • https://s3.amazonaws.com/tazibabebamep/little_mermaid_broadway_score.pdf
    • https://uploads.strikinglycdn.com/files/2fe1b6e0-99f7-4d27-b7e5-a9352c7e5f50/59182910692.pdf
    • https://s3.amazonaws.com/tasufagijaremo/einstein_rosen_bridge.pdf
    • https://s3.amazonaws.com/nigimul/62325215644.pdf
    • https://uploads.strikinglycdn.com/files/d8a28706-c421-4357-9356-354312c924d2/311147960.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_off0000f557.bin
fe828a55d175fa422fa08404fa39f742108b9013bec865a15ea95866eeb3289e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5280 bytes
font_01_sfnt_off00010753.bin
fc97f90ff5fbd45f5d44d4e0a922872c846f86530199cbe17998afad6150b7d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 10708 bytes

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