Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a637f51d5772fef…

MALICIOUS

PDF

83.3 KB Created: 2021-05-22 02:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 09e1f02c9cda06e7563768eb1c7ce4e9 SHA-1: 446df25745d070e8c4cc4e8dc35dc656ea4a4daa SHA-256: 5a637f51d5772fef2ce1e6f6b386746d37d0e7d3fc1e0188a5fc396f341bf4bb
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to other PDF files, suggesting a link farm or SEO spam campaign. The primary URL, https://kuzutuzo.ru/strik, is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=harry+potter+and+the+sorcerer%2527s+stone+book+chapter+10+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601fab7891505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_606b90fbe648e.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/3175711.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/1912238.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5ff42a30c8e0a.pdfIn PDF document text
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/1fd13d6fd38712.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/wetino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_6060b3b3074d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_600bfcd954c4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_605b9ec21faca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604e1ee27637b.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/3d8e5eac-d7d1-4897-862e-53548d7c5db0/23018343521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c337ca17-da41-441b-aae7-622b03022d9b/6181991153.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/types_of_ballroom_dance.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/22051298833.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/91475739301.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/superantispyware_free_cnet.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/82355587630.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_off00010565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 5776 bytes
SHA-256: b938c3f1c5c5efe2e790f017c6c943aa30ca6eb012a9543d047154810a998d42
font_01_sfnt_off000118ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 11296 bytes
SHA-256: f9e92af0f667c6e0abf89fc50c348b97106d11b0f29f27bcc420d2fb149f0774

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