Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4a4b62b588872e…

MALICIOUS

PDF

79.6 KB Created: 2020-11-26 08:41:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7132783c391de5af0e93082304801fe SHA-1: 8386b4a88fbd9d6e7c7fc59cd0f26cd164e917a4 SHA-256: db4a4b62b588872e108e3760289a596c46da30d3752513be04f54f5e32721763
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or are part of a link farm designed to manipulate search engine results. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=poetic+diction+examples
    • https://luzolujimus.weebly.com/uploads/1/3/4/5/134505858/mojim.pdf
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/25025fab7ff8886.pdf
    • https://cdn-cms.f-static.net/uploads/4379362/normal_5fb2c864d4e9f.pdf
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f8e00a354cc8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f25d1b3c-a870-4742-aec4-a415721ddb70/67856212479.pdf
    • https://uploads.strikinglycdn.com/files/744d223c-aae8-46fa-98cc-5edb44f4c8b8/85860758471.pdf
    • https://uploads.strikinglycdn.com/files/4b75c22b-531b-4f58-9885-f60cb0b44f97/zususawuvaluz.pdf
    • https://uploads.strikinglycdn.com/files/9335cda8-518d-460d-907c-228b349f7b7b/72746133024.pdf
    • https://s3.amazonaws.com/fowikorejodi/rumitefasabinekepixup.pdf
    • https://uploads.strikinglycdn.com/files/46fca701-cdd3-4350-a9ec-24697f72acd9/cloudland_high_school_football_tn.pdf
    • https://s3.amazonaws.com/saziwijaxodav/newisul.pdf
    • https://uploads.strikinglycdn.com/files/d54f8f38-cf6f-497a-916e-6ead0e6bdcd9/23846473461.pdf
    • https://s3.amazonaws.com/bewibiwat/xamarin_forms_acr_userdialogs_loading.pdf
    • https://s3.amazonaws.com/bulozor/xilolibenijagipavusov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec6.bin
de59da7902ac013c75c741a3c9ae533b85a75ce52be020eec9527b8554ea31a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 5192 bytes
font_01_sfnt_off0001005f.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 3720 bytes
font_02_sfnt_off00010bc2.bin
04464d2f7d6f26291c82023b7ffd34771d55f2bd359581d75bc2ed55dad07194		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 11184 bytes

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