Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc075d4554e4a25…

MALICIOUS

PDF

88.6 KB Created: 2021-03-12 01:08:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b297321f50d89c71c9950b9b91daa2ee SHA-1: 7a49064dd2025b7426f9161d2b49c37eb1c08301 SHA-256: 8fc075d4554e4a25d1f4d2961814ad73aab8336106434f3e4f6ed3ca37b9fd0b
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating a large number of external links, characteristic of a link farm or phishing lure. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host and present these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/123?utm_term=davv+cet+application+form+2019+mponline PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456372/normal_5fe438c52b4a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fdb7e817701d.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/vumofodeduvugule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387808/normal_600762c9e1261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5feb078d4de07.pdfIn PDF document text
    • https://cdn.sqhk.co/kopupelek/S2V9Zgd/xotoburezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5ff7818b556bc.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/OhcqjdZ/menumalegakiwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497346/normal_60248e8b678e8.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/21363984146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fe38846032ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_60004eb08ee5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368751/normal_5fca5b45e46f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447097/normal_5fcc7cda72604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_6023f214d144b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d4996ccb-aecf-47c4-aab6-3c4fe022e1b7.filesusr.com/ugd/b7ed05_c841e0b8472b4e1da655934dfcb52a7d.pdf?index=trueIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_80194177b0be4347ae94580adedecb90.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_d5b8636824ff4b1a93fe2746a6c48016.pdf?index=trueIn PDF document text
    • https://a97be2a3-bfb5-42de-bba9-b145341b31aa.filesusr.com/ugd/1f2860_3b2cb04b5e0f45c6ac4abac27644972f.pdf?index=trueIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/tizimituriposixidepipoko.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE70 5312 bytes
SHA-256: dee0735a68d538d7fbd920f8c0f22010ecb13ca713b476387e0a6de185838df1
font_01_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 4568 bytes
SHA-256: adbd8f7a8d11d579f5a51ca5c7eba66010b2a8371a14e4adcb38951f783b8599
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 11452 bytes
SHA-256: a17d03a4711f7fae76042b49c5868377ee20adef794a3ba1f51e2bd3f821b622
font_03_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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