Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ff334c71f29c2…

MALICIOUS

PDF

78.7 KB Created: 2021-03-19 00:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15727ffa67d3345d274c64e7cb221eaf SHA-1: 5f0585e01d1b496c133c5919b769fb061075dd4d SHA-256: ef5ff334c71f29c2dad03524912b17572f0561e15efb82734e33b13be552fee4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/wix?keyword=blue+fusion+200+plush PDF link annotation
    • https://cdn.sqhk.co/bamebuxi/gFoGPie/35836536722.pdfIn PDF document text
    • https://cdn.sqhk.co/bujiwamovul/ghIge3X/bosulalar.pdfIn PDF document text
    • https://cdn.sqhk.co/labokezugumu/igxdC5g/japoxebenogir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488570/normal_60458f3cd27e7.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/0BibQ97/whatsapp_status_video_song_app_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fca4c116fd9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_5fd07c1a73527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_60358c55a6b68.pdfIn PDF document text
    • https://cdn.sqhk.co/fotinegataso/gfYjjjb/1870037250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402745/normal_600bf03aa0c5c.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/icYJwu8/magic_tap_as_seen_on_tv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459796/normal_604583d7b81fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_601f7e40e1c22.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/Uii0hhu/xuxijipatigafibezujona.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/djffgjd/tagadogixasinexap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://besaware.epizy.com/twilight_full_movie_download_in_tamil_isaimini.pdfIn PDF document text
    • https://6cda4dd4-8aac-43e7-8003-7c0eea9f7907.filesusr.com/ugd/34e26e_3ab68258e6344ff78fe4386e17c1e39b.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_6ed2b687482f451795094ea76317f3f4.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_d0265bdccd5c409499b285676906fb27.pdf?index=trueIn PDF document text
    • http://rameselutem.epizy.com/islamic_banking_and_finance_in_urdu.pdfIn PDF document text
    • http://xipakugamuweren.rf.gd/aged_pension_application_form.pdfIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_8857277e202949fba53ff26a262cb3d3.pdf?index=trueIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_7525742b308a42b3874b9f7175b0bf11.pdf?index=trueIn PDF document text
    • http://kobizesamow.rf.gd/zedir.pdfIn PDF document text
    • http://regexepa.epizy.com/10592236553.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 5004 bytes
SHA-256: 43e3f759326e5b9eb89b3146678d3844537e171a66ce75d3a9dda6bf12c19461
font_01_sfnt_off00010660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10660 11352 bytes
SHA-256: 9823f919a81a9cc90c31fcaaf33bfa3362d0f7170d6dfb20c41456d5d3f9e174

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