Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebeffd052d3c6f79…

MALICIOUS

PDF

70.5 KB Created: 2021-04-25 07:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7aec8eb8fd4797101f32c34b09043b6b SHA-1: 2b5d2e2427d18eaad27cf5194bd3652591d95d6a SHA-256: ebeffd052d3c6f79abfb740adc047f929895c76340349dc41ded7b4478586d43
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and URI findings point towards techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=rainbow+magic+fairy+book+sets PDF link annotation
    • http://autobuff.xyz/jump_rope_material_for_salew85dh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_603889f3619a9.pdfIn PDF document text
    • https://xuxedujuwa.weebly.com/uploads/1/3/5/3/135345360/pubuwironedazip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_60419bfb658c2.pdfIn PDF document text
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/pufubiwas_ludexose_jivejedodaz_tutobetudun.pdfIn PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/139b15.pdfIn PDF document text
    • https://bufekebutejef.weebly.com/uploads/1/3/1/8/131856184/7a6a11473286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499635/normal_603fca09aa9ae.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/bixoziradelurixolopuzuruoy98k.pdfIn PDF document text
    • https://tiwoboromezusud.weebly.com/uploads/1/3/0/8/130874009/8f1482be.pdfIn PDF document text
    • http://revershjtb.site/traffic_racing_in_car_drivingbu8ce.pdfIn PDF document text
    • https://gasinokumujum.weebly.com/uploads/1/3/1/4/131437883/rifomutevirod.pdfIn PDF document text
    • https://sanakutubifave.weebly.com/uploads/1/3/4/8/134849958/4318634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367951/normal_6001b7cf32145.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/carmilla_descargar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51b4d20-4cfa-4b9f-b344-d8f11d1a7ad7/fortnite_error_code_ls-0018_fix.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/vipajimizurelozezagar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1ebe70-d653-4f82-b6e0-1822f64ea018/meade_lx200_16_acf_telescope_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f02c59a4-17a7-4793-afff-6a546bc2021e/how_can_i_check_my_rental_history_free.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_off0000d6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B0 5572 bytes
SHA-256: a0b172e7c0500b0cc01fc5486f7168f1d5c7adb0b0eb29ad9165176f73116437
font_01_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 10368 bytes
SHA-256: 3f2c218a7cda7ba4c9197914b2cea3a3f54e1993a22ac016ed6799ba06873d4a