Malicious PDF — malware analysis report

Static analysis result for SHA-256 282522cf6ab0bc7b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-28 04:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d28d1715a99d01805e5523199b9b93f SHA-1: 7fbfd1a5141e1e0202c651bb6a469a2af454ffdc SHA-256: 282522cf6ab0bc7b2784a30162f9a1a17a46c3b716b08417b900e57917919c0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, many of which are suspicious and likely lead to malicious content or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The presence of external links suggests an attempt to redirect the user to a compromised or malicious website, likely for credential harvesting 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://pelibifir.ru/strik?utm_term=what+is+enlightenment+meaning
    • http://thiswaytovogue.com/bittorrent_pro_apk_full_versionoy7ef.pdf
    • https://tonezesonor.weebly.com/uploads/1/3/2/6/132681734/abd53.pdf
    • http://creditscorehelp.info/sodilekamunajinugiguxalrefo.pdf
    • https://cdn-cms.f-static.net/uploads/4484623/normal_604e3775cd8ae.pdf
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601bc1bf7b2a7.pdf
    • https://cdn.sqhk.co/solijisivono/n2hbjfH/22334279081.pdf
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/balabukojasu.pdf
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6029e175c0c5f.pdf
    • https://pavaliwakugaban.weebly.com/uploads/1/3/4/3/134373235/5307150.pdf
    • https://tasuvuka.weebly.com/uploads/1/3/4/1/134108605/145615.pdf
    • https://cdn-cms.f-static.net/uploads/4506200/normal_6048c7b509722.pdf
    • https://cdn-cms.f-static.net/uploads/4414152/normal_603d16363d0a0.pdf
    • https://cdn.sqhk.co/ramawuvade/gywijtT/48408654578.pdf
    • http://greatholl.com/restaurant_7_steps_of_serviceyvak9.pdf
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fff7be0cba20.pdf
    • http://hiziryigit.online/graphic_design_the_new_basics_ellen_luptonlcp0t.pdf
    • https://cdn.sqhk.co/pigevikuwi/dgfgjrs/xakunugaturefemewek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_8ff6104514234d6195be974394c4c36f.pdf?index=true
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_6621c63a7c874c24a9c4f55215c637c8.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_8b3e52f388f34556bce57fb980ce8080.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_eace8722428a401bba317b123a28cacf.pdf?index=true
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_cc15a57eebc443f3b0a9f55c54d11b46.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_off0000fb65.bin
d45e68bb0f2e616fc774d1eac7df738ca3d262e0631d13e2ebabff9cac0a3744		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 5016 bytes
font_01_sfnt_off00010c5f.bin
0ccf2624dc5ed3b39cb4abcbf6a0b9f880c428c53a0187319af292937cb61c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 10444 bytes

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