Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39d4ae561a4b59a…

MALICIOUS

PDF

74.8 KB Created: 2021-03-04 17:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f312fd43c16926da925dcb034cc4d01 SHA-1: de4fcb72c68c4b11e931ec615ea2a3577857d955 SHA-256: e39d4ae561a4b59a1024dc32c261d8bb43662ef9b4a54797fb24bcc259d2f4b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary URL, https://golowaki.ru/wix?keyword=exploraciones+2nd+edition+answer+key+chapter+6, appears to be a lure to direct users to potentially malicious content. No scripts were extracted, but the PDF structure and link farm heuristic indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=exploraciones+2nd+edition+answer+key+chapter+6
    • https://static.s123-cdn-static.com/uploads/4388629/normal_6000b00572e20.pdf
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fdb6162bb2fe.pdf
    • https://gutinevar.weebly.com/uploads/1/3/4/6/134611255/kewedewegakudakel.pdf
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/nemujigularuwom-mugidamezimolep.pdf
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/4646f110dc670.pdf
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fd7dcabb4a3c.pdf
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5fed46bb18db4.pdf
    • https://mepalowe.weebly.com/uploads/1/3/1/0/131070826/e07cc9.pdf
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/2895008.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_068e9970691b4dc6a68ed8a69a2825a8.pdf?index=true
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_8cd34cd9cd364de39aab2109fbb6a93f.pdf?index=true
    • https://970c1b50-6489-4e49-adce-330d1cddb9b3.filesusr.com/ugd/6166c9_e147966f973f48f59c167dd61a57103d.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_01bd6cff50d94f1b9cea7f6a1f45dd04.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_382b3a1380874dd2a1b586701ccae620.pdf?index=true
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_5a7991d7a14d43fc95327c6b6bf49234.pdf?index=true
    • 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_off0000e5d2.bin
319bb51129983118505aa68813b3a3074cd7a8f8cd72819dcfaefb71e9628795		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 5732 bytes
font_01_sfnt_off0000f96d.bin
d7a64e13e31630de1f7ad12ae5dc98c065cd31803ade5e7dc4a2de60b0f1e44d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 10928 bytes

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