Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecc430aec04904c…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 04:37:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2ce18b8e6165eb6ed3adeb6f5e13bc1 SHA-1: 70ab1fb45150b17c3710745d61d3f79fd4b77d13 SHA-256: 4ecc430aec04904c6e506b9fd170a126215bb33289ea231140af9c438ac881a2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF link farm'. The primary malicious URL, 'https://seumenha.ru/award?keyword=prefix+suffix+root+worksheet+pdf', suggests a potential SEO-based lure or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the structure indicates a malicious document intended to redirect users.

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://seumenha.ru/award?keyword=prefix+suffix+root+worksheet+pdf
    • https://cdn.sqhk.co/winogolelog/dijxjj8/survivalcraft_2_download_pc_windows_7.pdf
    • https://cdn.sqhk.co/xemugugafot/bjbiggj/11855847765.pdf
    • https://cdn.sqhk.co/wesuwajil/haV5geH/peacemaker_sims_4_lots.pdf
    • https://cdn.sqhk.co/sunomedude/Vjeibi9/nobesobujajovuroravoranok.pdf
    • https://cdn.sqhk.co/tanemurad/iF1gjbg/67074344558.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_2537455227164776badffb17f0db86ca.pdf?index=true
    • https://s3.amazonaws.com/mipizaju/aula_virtual_ucsm_informatica.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_064061426f014bf188158ce26f78d9f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/654e3ba3-4ec5-4e85-ab6c-83a88922571f/sijebezezobegamuj.pdf
    • https://s3.amazonaws.com/bisazabe/flannel_sheets_crib_bedding.pdf
    • https://uploads.strikinglycdn.com/files/176b3c71-795e-4f46-9f6b-fdf9f8b72853/origins_of_the_modern_world_4th_edition_summary.pdf
    • https://uploads.strikinglycdn.com/files/4044df37-a327-45f2-bcb0-cf26f3c71ee9/18323262855.pdf
    • https://s3.amazonaws.com/jixerubowi/42387799952.pdf
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_5d65e062d9f34280995f04db25b3d4a8.pdf?index=true
    • https://s3.amazonaws.com/sefepugolupalax/fiwukisupolixoneguwul.pdf
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_9605fa28351541d2beaba605bc5c54fb.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_3f2e8dc2c064499b96acc9e2fa4fe13e.pdf?index=true
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_ce32620c77b94138a3d83bb6a076f776.pdf?index=true
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_5a25c649b99c4484800e242e64be77ab.pdf?index=true
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_bd680c512485454fa052a43f07e63e9f.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_off0000ea32.bin
4ba005725b93a9eb2e508b387ca0c9c89516032431dbd063c2007bac47c0cdd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA32 5112 bytes
font_01_sfnt_off0000fbb1.bin
96411bc32f8e51c3bb59ec32ddfd1de7e5186c7302b894f6a0a0388cc756f29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10792 bytes

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