Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bf8e2fb909f326…

MALICIOUS

PDF

80.4 KB Created: 2021-06-03 05:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b9bceffc9d2f1479b98901d6fe7f0db8 SHA-1: 92343d03f243ed638e86687d6cb58e441b081bf2 SHA-256: e4bf8e2fb909f32635877de6522f70bb8f9481805d7a2b0bcba870d69d270777
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'infusion de buprenorfina pdf'. No scripts were extracted, but the presence of numerous external links and the overall structure strongly indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://jottigo.ru/123?utm_term=infusion+de+buprenorfina+pdf PDF link annotation
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/fefadiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5fcd9709dcaca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454164/normal_5fe2bc4b42fea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_604e947b575cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484115/normal_5ff969bb5b1ed.pdfIn PDF document text
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/zipimolokiwolotofe.pdfIn PDF document text
    • https://xejigidusulup.weebly.com/uploads/1/3/4/7/134730122/9426a4f97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5fee81a533476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_6040211d05b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_60633528e0c29.pdfIn PDF document text
    • https://kesupegujofoju.weebly.com/uploads/1/3/5/3/135388852/4065480121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467325/normal_603e5a79caf03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5fddd0cd6f9a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_60256e82387c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451039/normal_5fec4addedd82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fcb23e1968a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5ffff36e55713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_6011ae24ce034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_60644d634b13e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2caefb5d-979f-4b84-bbd6-a57a9c5e42c9/sunbeam_luxury_quilted_electric_heated_queen_mattress_pad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb5df4b-91c6-4348-ad57-d2f2ea60e473/fodijesow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1653bdcf-7fe0-4c43-9192-bd4ef76fe76c/little_red_riding_hood_characters_traits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39f2977-c984-4cf7-b9a3-72cbf438fefc/80018888678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86fd30a-249d-4c9a-8754-9fc3e7e5d8c8/79337439773.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_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 5080 bytes
SHA-256: e1750ff22bef44beac97759b839cbbb3e6a6db70715ad0caaf274d32b45a743e
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 11048 bytes
SHA-256: 830355e5f0fa393b22a9ae32ff69ceb3e4c95e750deb17f4894d5cfa38078276

Open this report in the interactive analyzer, or submit your own file for analysis.