Malicious PDF — malware analysis report

Static analysis result for SHA-256 400bf015e64f1f0e…

MALICIOUS

PDF

81.9 KB Created: 2021-06-01 06:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 475950e4dd6a259b890a7eb2ff463046 SHA-1: 1f1c66ddc0e581235c8960db0a308644d056e65c SHA-256: 400bf015e64f1f0ec81900ffc52ef58e12d14edf48f5b8b1f843d961dbdd0115
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful 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://coretry.ru/pbw?utm_term=%25C3%25A9lodie+bouchez+filmleri PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371014/normal_6056005f49fac.pdfIn PDF document text
    • https://kipuxemoxux.weebly.com/uploads/1/3/4/6/134616309/481807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_6048a7309ac24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5fdca8e4c7aec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375077/normal_602831b24a24b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5ffd1cfec9ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_606c79f8c4f0f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481411/normal_60b2f9c78bd59.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/b7f2e241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_601b55dcb07cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414701/normal_602e0ef222379.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412773/normal_60affc549cea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_6056c59fa0fd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144443796/btnotification_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a26914-d180-40ff-8cba-a63ecdbbf814/will_eugene_oregon_get_snow_this_winter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824985e1-1d1e-4c38-b4b2-beaa2af83510/price_of_nikon_d5200_in_nigeria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345f9c4b-0e66-4378-825d-5d1936e1f193/atlas_copco_air_compressor_model_ga_37.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d47138-a274-403f-8020-8caaabbae307/the_lies_of_locke_lamora_hardcover.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144437508/wumibonikudumebezurata.pdfIn PDF document text
    • http://wusagem.pbworks.com/f/32654289889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992d9968-b78c-4831-b99d-0dcadb188a2b/31595916000.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/dusobuz.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144434214/good_night_kiss_gif_images_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 4596 bytes
SHA-256: d16727fb7d29b8c048d991784b422e916ec02156052219e7f0ed2812fec4b193
font_01_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 5040 bytes
SHA-256: 4d0554a364cfc61a0851093485aa63c576974182ab6541d5d1355f1515a24bff
font_02_sfnt_off00010f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F42 13216 bytes
SHA-256: 38062bcb0852172de7970c93cd7b8e3cb2f347abfe3a76b824be21251cfeb932