Malicious PDF — malware analysis report

Static analysis result for SHA-256 9649d4fee3cce3cf…

MALICIOUS

PDF

67.0 KB Created: 2021-03-10 14:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 005200d3de6decaf2facb87c39f800dd SHA-1: 96da417e3dc503ff694eabf0f1915ece1561017a SHA-256: 9649d4fee3cce3cf8936fff884f565a59870e77ad250725d0ace98944a82f170
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to disposable hosting, suggesting an attempt to manipulate search engine results or distribute additional malicious content. The primary purpose appears to be directing users to external resources rather than delivering a direct exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/wix?keyword=patagonia+simple+guide+pants PDF link annotation
    • https://rukegimamu.weebly.com/uploads/1/3/3/9/133986924/474a29fdf.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/15eb98d1.pdfIn PDF document text
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/14ed0.pdfIn PDF document text
    • https://sujuxeneme.weebly.com/uploads/1/3/1/3/131380470/a85879ea45b03.pdfIn PDF document text
    • https://valivefeku.weebly.com/uploads/1/3/6/0/136050987/9060262.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/3990717.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/bujomagegu_nixuvaw.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/4604273.pdfIn PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/f86c0ba2458ea5.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/2100038.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/cb9429ddf138.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/2bb69a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_c5d0ec32e4584f1895bfcbedf225b43c.pdf?index=trueIn PDF document text
    • https://f45985d3-969e-4a4b-a16b-f92b7c881388.filesusr.com/ugd/20da2d_65faeb3fd1204b3282497439198cf208.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60106161-f0f8-461f-b730-78a4b8d1b545/69906068940.pdfIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_25fb359ac5de4a4da7d9b2f37d85576a.pdf?index=trueIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_8e970bcc59834a1381c8613fb0371edf.pdf?index=trueIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_bbc02e3705da4982bd5af3b04bfa7f48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e953aa72-5424-496e-918f-0bcd2c0700d5/beraluwasexuxi.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_409ad7c084724ac0a82c4b3b1aec691f.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_e16c53bdd0b843848f2808bf7ca49150.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 5184 bytes
SHA-256: d91e3167b776d264854404aac7884cee7776e86d57363a5af0e01060189428d8
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10608 bytes
SHA-256: 2f4bef74367a6aaadb72e9578952ef05fe9b7688fe2da5a4b141173f69c59096