Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed174765b349b03…

MALICIOUS

PDF

77.6 KB Created: 2021-05-15 12:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97fe0da781686f55ed40eb0676428043 SHA-1: a8082bcaa5809c403d102e93e963fc43dd6fec5b SHA-256: eed174765b349b03b511e9a6b98056a81cc0964fe7c2c6a4fd6d254fd4f81d56
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a PDF containing a mass external link farm, suggesting it's used for SEO manipulation or to redirect users to malicious sites. While no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://leonvi.ru/strik?utm_term=what+to+pray+for+in+a+future+husband
    • https://cdn.sqhk.co/nufesewepi/e90kje3/gemifomaka.pdf
    • https://cdn-cms.f-static.net/uploads/4392207/normal_603389fbd88dc.pdf
    • https://pijuzuzubafewo.weebly.com/uploads/1/3/2/6/132695302/kogogej.pdf
    • https://static.s123-cdn-static.com/uploads/4365607/normal_5fc6626f749d1.pdf
    • https://cdn.sqhk.co/nuduniguwufo/IlUJjh6/79325757722.pdf
    • http://genoray.pro/all_logical_functions_in_excel0jkxe.pdf
    • http://cccckkkkkdd.space/xifekasifarudovivkgur.pdf
    • http://bcpzonasegurape2-viabcp.com/sodudiwanukowuzezudetol8rvzy.pdf
    • https://cdn.sqhk.co/goronikel/eGycIl8/rules_of_survival_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6050d35984afc.pdf
    • https://cdn-cms.f-static.net/uploads/4377403/normal_604696eda29af.pdf
    • https://jirilerimu.weebly.com/uploads/1/3/5/9/135967849/6a85d247ce9b.pdf
    • https://static.s123-cdn-static.com/uploads/4418584/normal_60090cf924ea2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lomuper/sepojejokomuvaseg.pdf
    • https://s3.amazonaws.com/zetituri/40629140735.pdf
    • https://s3.amazonaws.com/genijusemu/19645144667.pdf
    • https://s3.amazonaws.com/dukavunivifa/courgette_instead_of_lasagne_sheets.pdf
    • https://s3.amazonaws.com/voxazedisula/conair_hair_cutter_walmart.pdf
    • https://s3.amazonaws.com/mubemutolewe/jusojasagewebozuwimurit.pdf
    • https://s3.amazonaws.com/fedufiporara/xawapigipexemawelanu.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27e.bin
f16ae19c5a74154055a526a4a57a5c67a45a37c2b7d7478eba541951c5659bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 5352 bytes
font_01_sfnt_off000104bc.bin
ddd3ed734bf24a35cb64cb09c309e8b278260ca87a57e3892e01b0f9d1a80697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BC 10660 bytes

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