Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fa4c108e02f051…

MALICIOUS

PDF

102.2 KB Created: 2021-03-06 20:37:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b02a6e2f09607e8005782ced563e4a29 SHA-1: 6d802dd6ba01647f70afe7f9112c1e591a4a4368 SHA-256: d8fa4c108e02f051e4cc035de125b64ec24347ced4ee80bf68c3c1843aa2db88
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains references to "Einstein's general theory of relativity formula" which is likely a lure. The presence of numerous embedded URLs pointing to disposable domains and link farms strongly suggests a phishing or redirection attack, aiming to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://baarspo.ru/strik?utm_term=einstein%2527s+general+theory+of+relativity+formula
    • http://strapslap.online/5512985002dklvo.pdf
    • http://retys.fun/tolejelonilee4hvr.pdf
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5fef3cea947c9.pdf
    • http://foodguideblog.com/gelenubikijudaremekakavsfeb.pdf
    • https://cdn-cms.f-static.net/uploads/4391009/normal_6041896bef7a9.pdf
    • http://sait-ok.ru/plantronics_voyager_legend_cs_b335_headset7jppf.pdf
    • http://meetsol.xyz/why_do_atoms_come_together_to_form_bonds8ds0j.pdf
    • http://uspex22.online/74608673195yrajn.pdf
    • http://pristav.pro/star_wars_ahsoka_white_lightsaberf4ky6.pdf
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6024eec02ab15.pdf
    • http://auto-fishing-rods1.club/bcycle_houston_promo_codeaxpiz.pdf
    • http://amorexpo.com/51671858567w0nz.pdf
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5fca8dd35c4ec.pdf
    • http://drive4mclaneeffingham.com/what_to_do_if_your_roku_stops_workingn6zc4.pdf
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fccbc6e4fbac.pdf
    • http://libralab.digital/topuxrzcal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_1c64ea1f1bb04511801f99063931aeca.pdf?index=true
    • https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_e530f16628b7463b9e5c6a128635db91.pdf?index=true
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_e2a2437b6fc84f278d996edc4e3e0559.pdf?index=true
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_ca0e0a378e5e40e58b69f19dcbba01c5.pdf?index=true
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_673dcbf0bfd64b2b8580e9261f2ec56b.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_f21886e6a6db4b658c9dbb7afd812715.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130ea.bin
58fa6b511827d0b9ff4c4d600975e35c9e09c0a2b355d23be6ff749c6eea30dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130EA 5332 bytes
font_01_sfnt_off00014301.bin
c9ff5e11a729face4ef5ef73171ce6b1fef8b31d74f31823c0800fc975f038bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14301 14604 bytes
font_02_sfnt_off00017415.bin
c3f4daf87bd991286a272c81413967efc8b45f11c319848930383fb2b5ff3459		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17415 16080 bytes

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