Malicious PDF — malware analysis report

Static analysis result for SHA-256 628988fe8cb4f11d…

MALICIOUS

PDF

76.6 KB Created: 2021-05-22 09:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 02d1cb864d909b1ac0749d5a5a30a6de SHA-1: dbca6cb135b9d1b815c77f39760f2d10342dd61d SHA-256: 628988fe8cb4f11d4d87e44b7ad7bcd6a7974b42c77ebb37c3e412d7f20d56f4
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary malicious URL identified is likely used to redirect the user to a phishing site or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=first+order+and+second+order+differential+equations PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454821/normal_6009a3ad4831b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_605ad83ebc527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_605bc12762d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_60636b9574757.pdfIn PDF document text
    • https://woxumonukoke.weebly.com/uploads/1/3/6/0/136090180/xobujefalofabiduwu.pdfIn PDF document text
    • https://siziloxa.weebly.com/uploads/1/3/4/7/134747516/dunolanowenixezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6039a8af8aa84.pdfIn PDF document text
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/2677481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499317/normal_5fe999a7e82ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_603124b6bdb2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_605c710c0fa06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504922/normal_5fe2ca2690ba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_6002247e48781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365998/normal_5fe0562a3b10f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_6056776e67c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_6003dafbf0fd3.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/3ce9330c-7297-44ce-8491-08d97e097ecc/why_is_my_hyperx_cloud_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3176f3-fa67-4c2c-bcf3-d55dabe928a7/is_gimp.org_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/what_does_it_mean_when_a_statement_is_too_narrow.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/best_virus_protection_for_android_tv_box.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/aroma_rice_cooker_manual_arc-_914sbd.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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5096 bytes
SHA-256: 6d8405705e81d150a92a833acaa17dc8692c656980b997b3ea58df0e1882c636
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11108 bytes
SHA-256: 4544ad9f15da1a3782d66569793822631c69366a0e05f9eba10b7f3cf8a9a8a2

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