Malicious PDF — malware analysis report

Static analysis result for SHA-256 049d90f9e1aff309…

MALICIOUS

PDF

134.1 KB Created: 2021-05-29 04:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: a4cc9b9ed27953873f2a447866df1a48 SHA-1: 733448b0b17f1533ae46bc892a182cfa60a03a9d SHA-256: 049d90f9e1aff30951b30ba2a8b524d0e40cdb4620b13558e6ead172159f9f24
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the heuristic firings suggest the primary purpose is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/e90d6dfd35fa3c.pdf In PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/036e8ba3af18.pdfIn PDF document text
    • https://pekonupag.weebly.com/uploads/1/3/2/7/132741447/4707348.pdfIn PDF document text
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/4017057.pdfIn PDF document text
    • https://jevuzukolusiwu.weebly.com/uploads/1/3/0/7/130739503/dobunovupudo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453743/normal_604f14061d3c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_6022ef0ac5533.pdfIn PDF document text
    • https://vegirizixe.weebly.com/uploads/1/3/4/7/134716682/0d11b4797.pdfIn PDF document text
    • https://bitokulizawefe.weebly.com/uploads/1/3/4/6/134684274/7492156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_604a5b8665b06.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/008b88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5ffbca67326f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_604fec5dbeb50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=what%20is%20simv%20mode%20on%20a%20ventilatorPDF link annotation
    • https://uploads.strikinglycdn.com/files/8576d622-1c5d-476a-83f1-e5a8e41a12e6/87849871798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d732ca06-6469-4862-ac38-233741ee1e69/tojademinodarulus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12bb5e96-0eed-4628-92b7-1cf9511dec99/66678667677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46fe8436-efa8-4b31-a671-f395b56f0ca5/how_to_get_minecraft_realms_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1124cf62-e3fe-4e18-a6ad-14b4bb936e00/88141368897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff16aba-a65d-41ee-b4de-1ba1be7831ca/68407493568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71fd1470-cea5-4a1b-97b5-0a998b02e861/how_to_do_emotional_freedom_technique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31cb2ecf-72ec-454a-88de-841c485be8d0/el_juego_del_angel_carlos_ruiz_zafon_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40691f8b-5b02-45cb-a3e1-5b04786a297a/how_to_install_vinyl_lettering_on_walls.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA7D 5140 bytes
SHA-256: bddf19ae4f8895571a4907c5c7d4fac6f15bc74cdcf65f4fe8f29f6927b8ebb4
font_01_sfnt_off0001cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBD8 12292 bytes
SHA-256: a82deaf28a34d42166d1497eb711acaf7e2f74fad983900d894ccb65244d5d0c
font_02_sfnt_off0001f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F4CB 16236 bytes
SHA-256: c7ffdc1a4c74a6b93a484595822eb34313622041bd486d5395fe8f95e0f800c7

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