Malicious PDF — malware analysis report

Static analysis result for SHA-256 eddb864cf7c54c64…

MALICIOUS

PDF

97.7 KB Created: 2021-03-17 21:58:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a5eb36ecfe6488be0c267a5ef036fd98 SHA-1: 39e891a4e0e8448130b7ba037f9c9a1dfc101884 SHA-256: eddb864cf7c54c648db656db40d3e3c8100aea004c44895fb13fb214c23bceb8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are numerically or generically named PDFs, suggesting a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://bologen.ru/award?keyword=consequentialist+ethics+pdf', which is likely used to redirect users to malicious content. No scripts were extracted from this sample.

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://bologen.ru/award?keyword=consequentialist+ethics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411001/normal_6016803574cd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491157/normal_5fe15f1bd8c14.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/gghjuic/guidehouse_insights_hydrogen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_60511fedae71b.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/Gjc6Zgi/play_truck_driving_simulator_games_online_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_6031cfbc95542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fe778ea42306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_600bf6dfb1c11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419002/normal_5fcbb37ad2384.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/7326423326.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_44b0536566864eabb6aaa3e95c2cb128.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/estudio_descriptivo_ejemplo.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_dc90094ab9a841b8b8213f7557c81f38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nevowimo/35026613165.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/what_are_the_five_intermolecular_forces.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba63b80b-c417-4511-a741-d89041f80d01/66482913152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e60a7d1c-1dfa-4cc5-8c10-391c8003f900/dinozarejibanow.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_off0001436f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436F 5180 bytes
SHA-256: 4534c75b359af2df581bd7c747361cde4ec30c86dfb4e6bd9e84923af8da097b
font_01_sfnt_off0001550b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550B 10924 bytes
SHA-256: 4964f345bfa786dff907531ec9ad05210905af06583df3c6faae814ca86e9345

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