Malicious PDF — malware analysis report

Static analysis result for SHA-256 377d88d8d6f9d904…

MALICIOUS

PDF

140.4 KB Created: 2021-03-21 23:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 949699eb9d03bd513f5d97416671e808 SHA-1: b15c936d4ebd557d8631e956caf801070d533e53 SHA-256: 377d88d8d6f9d90484f0253bf91572057b23af4c2a4d66b53017b794778c92d5
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. One prominent URL, 'https://xezojetit.ru/award?keyword=numerical+analysis+bisection+method+example+pdf', appears to be a lure, masquerading as a search result for a specific document. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://xezojetit.ru/award?keyword=numerical+analysis+bisection+method+example+pdf PDF link annotation
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/809dda074f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388274/normal_5fef9a2076561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_602e9fbd09dcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5ff2d3580ce07.pdfIn PDF document text
    • https://siziloxa.weebly.com/uploads/1/3/4/7/134747516/c748490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478923/normal_5fdecb7ea210f.pdfIn PDF document text
    • https://virenejamavik.weebly.com/uploads/1/3/4/1/134131854/2720893.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408186/normal_603208c5ebcad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe164fb09f3b.pdfIn PDF document text
    • https://fisomekoxow.weebly.com/uploads/1/3/5/3/135326807/nupadotutoru_gaxifivekuxodix.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/9ae484da4f7397b.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://s3.amazonaws.com/fupanabivote/abbyy_finereader_7._0_professional_edition_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b67470-c4b8-4dfb-8d00-feccef612e78/how_to_help_stop_climate_change_as_a_kid.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/58824437461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c68b472-7f6b-43ed-b7b9-441de6c17c16/python_requests_post_json_with_basic_auth.pdfIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_ebfd517c8d3045f890ab42144af7b3bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/xaxanela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b777be46-1f78-4e2d-a7cd-356f524654b3/4993628986.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_9bf85f976ffa45cabb7cc7f8a24d26b6.pdf?index=trueIn PDF document text
    • https://2a1457bb-a4d2-449b-8914-d784a503a6da.filesusr.com/ugd/c0fca2_929774891c214e359e313a12575e4f54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a89b78ed-c91a-419d-860a-5c6b7b39d970/74721397325.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/guwurixizugevunobubobi.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_3b2088dab64f4371b9d8c8252c6933ea.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCBF 5556 bytes
SHA-256: bd2096f270bfab32904399b0236ddd2e7efba0964c001f85aea9c25a7b43a858
font_01_sfnt_off0001cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF6F 14144 bytes
SHA-256: 888e529d12f1259498e72407187c1de75a690e9f754d3e66b260af1e7a2a5e0f
font_02_sfnt_off0001fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD3A 16280 bytes
SHA-256: c8afb06aa3bef3398a8e8f89fa832fc9468e47f6f896d133cff4814fdecca061
font_03_sfnt_off000212e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212E5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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