Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fbffe16e9470bd…

MALICIOUS

PDF

79.4 KB Created: 2021-05-13 06:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f2eb831b6e1d54d0235a7f6544b9a60 SHA-1: d04398fd52e78b12c6fb09980fc551afd8356b62 SHA-256: 61fbffe16e9470bd2e83dd92027f44838f54868b0f4ca0effe2c2fdbbbe02c3e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing, designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/strik?utm_term=state+hospital+west+nampa+idaho PDF link annotation
    • http://koreanluxe.com/tedejisuzerutoparcc4c.pdfIn PDF document text
    • http://hookup153.online/android_adb_shell_uninstall_app7eoyh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_603323243b9d5.pdfIn PDF document text
    • http://uber-global.com/what_are_the_effective_communication_techniquesaykn0.pdfIn PDF document text
    • http://arfeshome.com/chikni_chameli_video_song_3gpplxvq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459791/normal_604494228193e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_601f5cfbb6428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6056edd328a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_603d7466e5e9d.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/47457338719z0osk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5fe4327396986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_60695b1f21002.pdfIn PDF document text
    • http://bodyita.space/manual_de_diseo_de_obras_civiles_cfe_hidraulica29mp8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_603153dca27cb.pdfIn PDF document text
    • http://fishing-rods2.club/pyromancer_dark_souls_1_guidel7dua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidajewaset.epizy.com/caramel_baby_and_child_size_guide.pdfIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_b89e54c1462e46939c53452cf8321f4a.pdf?index=trueIn PDF document text
    • http://duginefasozuna.rf.gd/53939876865.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_5b53df7a69d949bea5618d8326b3ac13.pdf?index=trueIn PDF document text
    • http://vaxutere.rf.gd/how_to_set_unloader_valve.pdfIn PDF document text
    • http://vobixudijo.rf.gd/7225944668.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_off0000f5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 5300 bytes
SHA-256: b726f00cec4452acf8ba92fb847a5fca0a90a83470124230cfccc02257298332
font_01_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 12048 bytes
SHA-256: 7df8859b72e4a93c67efc7fa1ffb7a0c4daa2c87cee0455e9a48e831521aa95a

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