Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f51289db3c050da…

MALICIOUS

PDF

79.1 KB Created: 2021-05-14 21:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9a2650e1f46cabf6099d78e442bcb1ff SHA-1: 27120f240e0af6f8f36cb5d7083edb5f7e80a24c SHA-256: 6f51289db3c050da9208141d65266433adc836d4673ff499b7bff43e2a393862
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. ClamAV detection further confirms this, identifying it as 'Pdf.Phishing.Trojan'. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL patterns point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://jottigo.ru/strik?utm_term=vizio+tv+e600i-b3+bluetooth PDF link annotation
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/16b2388591c55aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407316/normal_6004b4016c421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_60274fc5bfdb8.pdfIn PDF document text
    • http://am-sound.ru/unifi_uap-_ac-_lr_softwareifwbv.pdfIn PDF document text
    • http://bloomwithdeanna.com/33661515366pv8ws.pdfIn PDF document text
    • https://cdn.sqhk.co/zanotunuzi/genogkO/desh_bhakti_song_ringtone.pdfIn PDF document text
    • https://cdn.sqhk.co/lebuwoxetale/gFn9Tgj/business_management_jobs_melbourne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469106/normal_6066ff7e00c3d.pdfIn PDF document text
    • http://psylath.com/7348105249030ao2.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/11ab1023.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/Sm0ggVM/dictionary_python_change_key_name.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/foxiditakopip_juwasep_zimanovuz_dijudal.pdfIn PDF document text
    • https://fobuxowomi.weebly.com/uploads/1/3/4/2/134235628/jakonutuvimuruwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475564/normal_60663e7c19560.pdfIn PDF document text
    • http://easybranding.org/what_size_belt_for_john_deere_l110ol1du.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_60503b2a2b6f2.pdfIn PDF document text
    • https://cdn.sqhk.co/refimadaraze/hgbz8kD/autorhythmicity_of_heart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_a73b1364b80e484da3ef860c0929eb81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7fe6a3e-a70a-4869-b742-f4b7d347ff36/remiwiveri.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_c93908bb449c49fc8129f4145fc8b3a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f26630-b2b8-467c-95fc-edf4abbc1f9b/59363925216.pdfIn PDF document text
    • https://7292b199-6d7c-4e84-b646-7854114497ba.filesusr.com/ugd/53361e_236e658770384b58a6c6b7cc1747b89c.pdf?index=trueIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_2089dd16c4764e85a8958eef86308533.pdf?index=trueIn PDF document text
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_5b6bc7dddfa54dd08637f69ab8e1e7af.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ad6d86-0fda-4ce5-ae4f-149a3a2b4433/what_type_of_water_filter_for_samsung_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb1a6ea-5b2e-4639-8bfb-25be7ffc8d53/modos_de_produccin_comunidad_primitiva_esclavista_feudalista_capitalista_y_socialista.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_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 4996 bytes
SHA-256: c2dc722701d86ada2adbace2290da56bf6915ef4a27c4cfcd86efc259cf4eb1c
font_01_sfnt_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 11044 bytes
SHA-256: 8f00b37d3b3e8754acbceb3c6fccd9ba1a0012cfffc364f98322dc1023656247

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