Malicious PDF — malware analysis report

Static analysis result for SHA-256 03eca8a1150848bc…

MALICIOUS

PDF

91.7 KB Created: 2021-04-20 17:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 00babcc631061682baccf00e094c3554 SHA-1: 0b6f85d5e3725b07546dc00dc60ca54e2f60ec13 SHA-256: 03eca8a1150848bcc81e9894c1634ea1f24b8a34db59a9b3d0ec383abe0bf58b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'leonvi.ru/strik', suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=dremel+3000+ph+price PDF link annotation
    • https://cdn.sqhk.co/lotidonita/aV9HhdO/numiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/pOihPYr/tunerexunezega.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/notevugikaparow.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/busuporijokafisopabitebob.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_7ad0458a160b41e0a147b89b0fe1d882.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_8b87377400fe49e09a981d61759d771b.pdf?index=trueIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_ad324f3614954071b492b42409fe68e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/diwivozesivijowojixivibul.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/74321787245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4279a5cd-5072-4488-8873-68467187f89a/haydn_trumpet_concerto_3rd_movement_accompaniment.pdfIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_54c91b709b95404885f34f1434c404e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomepixo/bofeb.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_12e6c8b1dfe84ce7a613ddc3a1d2d900.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/89512597650.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/xexubokatuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/48933991244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33999879-da96-41c1-a426-77b314a4d76f/what_does_milk_and_honey_signify.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/69442802074.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010aa6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10AA6 16536 bytes
SHA-256: ac76e44ddd2e0bf7c36c96292739f3ad8f351addaf8b9d9f147d4ec65ff1b222
font_00_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 5092 bytes
SHA-256: e8f566705fccda6f72bde9f0f87e7a128889564df0b4d58f3ac837f4a43741b6
font_02_sfnt_off00013749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13749 11584 bytes
SHA-256: f6b4d9387755dfe48d47da0993915367ffcb4ea08b84a1c6c76e8c469d1cdef3

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