Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b69cac6d46c2fd2…

MALICIOUS

PDF

69.4 KB Created: 2021-03-09 16:26:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 88d9d6eda136d9894944a5507505aa27 SHA-1: 416622ceb0da26ae3fa386c340165b42386aaa14 SHA-256: 7b69cac6d46c2fd225755613fdeac4a89a00afe6d36c8080fc196afad3e4f52a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document that contains a large number of external links, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_LINK_FARM heuristic indicates the document is designed to host numerous links, likely to redirect users to malicious websites. No scripts were extracted, but the presence of external links suggests the PDF may exploit vulnerabilities or serve as a gateway to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=the+adventures+of+tom+sawyer+mark+twain+oxford+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472481/normal_603ebbba59ee1.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/debapulowa.pdfIn PDF document text
    • http://sisogelodaze.medianewsonline.com/53536324980.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5ff79d0254efd.pdfIn PDF document text
    • https://wekexobesunolo.weebly.com/uploads/1/3/0/7/130739288/6754992.pdfIn PDF document text
    • https://vizefibamoraxob.weebly.com/uploads/1/3/4/6/134613498/dfaf8b.pdfIn PDF document text
    • https://guvusogom.weebly.com/uploads/1/3/5/3/135324715/1872424.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/how_to_fix_slow_download_speed_ps4.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/2527368.pdfIn PDF document text
    • https://tamoniwezetiro.weebly.com/uploads/1/3/5/9/135961995/tasevifirubabeg_juxagin_wufigosisunasi_supekilusuzuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_61c5cc5eddab41c2a4397be6204bfcfb.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_9ccab88cd83945febfa1db8d61a55982.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_34e616f24e554494b5ce36378391317d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/nsw_ambulance_service_clinical_practice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/36048740921.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/apa_format_citation_book_two_authors.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/tozejebixiruxeda.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/82626650520.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/battle_of_unknown_squad_battleground_survival_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/aggiornare_fortnite_android.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_off0000d126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 5584 bytes
SHA-256: a15388b519af7186c0a34e0e4d84f07dbf5b0c92e8f4c44756df2ecb64674faf
font_01_sfnt_off0000e41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41A 10504 bytes
SHA-256: fd7f7642620ceea0d47e17f26cee5bb90a60b723bb536ddce433ddcab73e5aaf

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