Malicious PDF — malware analysis report

Static analysis result for SHA-256 949a7ea277422705…

MALICIOUS

PDF

84.3 KB Created: 2021-03-20 23:40:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 389bb2759e4a0e0fc7f735661e72b6c1 SHA-1: 8244aeb353bd60093f6d68a1614e480da9bb4c1f SHA-256: 949a7ea27742270538478a33b14a3679a1118dcc57c55b55210298cecbb91285
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being vilenefex.ru. This suggests the document is designed to redirect users to potentially harmful content or phishing sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving credential harvesting or malware delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=the+tragic+myth+of+orpheus+and+eurydice+plot
    • http://copytoshka.ru/can_ch3ch3_form_hydrogen_bondshj5kb.pdf
    • http://noksipals.online/tercer_cielo_yo_te_extraare_descargghda6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_724b71a10be746c491057e7960bb247d.pdf?index=true
    • https://s3.amazonaws.com/memexelu/ginedife.pdf
    • https://uploads.strikinglycdn.com/files/092c32c2-4f8d-4304-a93d-299d7a5a75aa/wesibepagakej.pdf
    • https://s3.amazonaws.com/gezizefefififa/desududo.pdf
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_76b22af648704bb69ba59862507df80b.pdf?index=true
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_b4c24069be934597a28922327dfee494.pdf?index=true
    • https://s3.amazonaws.com/sojebelevenex/13292167549.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_013c6f56d1c0462981b8d1d505525546.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e8a7a55-09eb-486f-84e0-90fd9e49a910/how_to_pair_a_k780_keyboard.pdf
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_1d189e41917c444e9c7bae1b10aa5285.pdf?index=true
    • https://5a2ada08-5b6c-402a-b0df-3636415b461e.filesusr.com/ugd/434ae6_03ea38ce8bb44dcda0f19f8ee9b21e35.pdf?index=true
    • https://s3.amazonaws.com/saziwijaxodav/isosceles_triangle_theorem_worksheet_2.pdf
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_60b3969729ee4a8182820aff44a5ffe8.pdf?index=true
    • 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_off0001015d.bin
89cddd416507d21181f0526a73b4e35b5b79e14e9ef0744bd785f7410e3104a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015D 5620 bytes
font_01_sfnt_off00011459.bin
5e8f22cd766f6759d1df2ae7be825fc8c97087fb2d93b749ea6433cf82ad6628		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 15092 bytes

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