Malicious PDF — malware analysis report

Static analysis result for SHA-256 7617588721d9fbed…

MALICIOUS

PDF

77.9 KB Created: 2021-06-05 13:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca3dcdd5715302d910312e7e3ce015e1 SHA-1: 68a956a8803545c500d51454d5d620be837d68a4 SHA-256: 7617588721d9fbed402204cb8c6e3e87cfdb33ede27ffdfcf4157433be840ce2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to file-sharing services, suggesting a link farm or distribution mechanism. The primary URL, 'https://oniceh.ru/pbw?utm_term=psx+emulator+d3dx9_26.dll+missing', indicates a lure related to missing DLLs for PSX emulators. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. No scripts were extracted, but the extensive linking pattern is indicative of malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=psx+emulator+d3dx9_26.dll+missing
    • https://cdn-cms.f-static.net/uploads/4484812/normal_5fdae40a674a1.pdf
    • https://static.s123-cdn-static-d.com/uploads/4471464/normal_60b0082cadab9.pdf
    • https://static.s123-cdn-static-d.com/uploads/4405945/normal_60b02e0845519.pdf
    • https://lurufabufukigo.weebly.com/uploads/1/3/1/4/131407807/44730e72.pdf
    • https://pafutidosuzov.weebly.com/uploads/1/3/5/9/135989867/regeselatokimi.pdf
    • https://cdn-cms.f-static.net/uploads/4390641/normal_6067d8163578a.pdf
    • https://jijubukaxujofi.weebly.com/uploads/1/3/4/8/134892288/96d4af.pdf
    • https://sisebafob.weebly.com/uploads/1/3/0/7/130776599/felal-boruzomigur-refifaninazab-viwagawatila.pdf
    • https://cdn-cms.f-static.net/uploads/4469643/normal_600d280d82921.pdf
    • https://static.s123-cdn-static.com/uploads/4459464/normal_600623167fc43.pdf
    • https://cdn-cms.f-static.net/uploads/4473023/normal_5fda30908f88c.pdf
    • https://cdn-cms.f-static.net/uploads/4471085/normal_60244f5f7dbac.pdf
    • https://static.s123-cdn-static.com/uploads/4456372/normal_5fcd9b7ce14bc.pdf
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fe74e498f029.pdf
    • https://cdn-cms.f-static.net/uploads/4368735/normal_6057b074e33ac.pdf
    • https://static.s123-cdn-static.com/uploads/4456376/normal_5ff25017c7aaa.pdf
    • https://nimapefakapag.weebly.com/uploads/1/3/5/3/135324130/gugaperab_dujefaletejob_sakopuki.pdf
    • https://cdn-cms.f-static.net/uploads/4426967/normal_6048c83ccf03f.pdf
    • https://static.s123-cdn-static.com/uploads/4383452/normal_5fefffadadab8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://niwomif.pbworks.com/f/xutiwif.pdf
    • http://kusarolox.pbworks.com/f/kali_linux_tutorial_download.pdf
    • http://zolunegoli.pbworks.com/w/file/fetch/144559740/wilugogadanezo.pdf
    • http://kuzimotum.pbworks.com/w/file/fetch/144538938/compendio_de_criminalistica_rafael_moreno_gonzalez.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_off0000edc6.bin
7b85ad461f5e2eeb95454a06d0e79eb62199a83a9edd7890ef238e9d3b6eb6b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 5884 bytes
font_01_sfnt_off000101c2.bin
f81ce93e8c3b911e19cede48ae44ecec2632a73ce851e72e74bcb0d4fbf760f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 11380 bytes

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