Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d321e7a43f6e45…

MALICIOUS

PDF

66.0 KB Created: 2021-03-28 11:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bab056f59213349584a56b1f82e8c67 SHA-1: 57a278785c59577eb42078fb72ba241d8cba2309 SHA-256: 86d321e7a43f6e454830988b6737b5af7ed2a750307eaff32466835eab478be5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to PDF files hosted on various platforms, indicative of a link farm or a distribution network. The primary URL, 'https://zajinet.ru/strik?utm_term=how+to+address+a+doctor+in+japanese', suggests a lure related to Japanese culture or communication, potentially for phishing or malware delivery. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=how+to+address+a+doctor+in+japanese
    • https://linazigamatamab.weebly.com/uploads/1/3/1/8/131856602/657ebd70fd91.pdf
    • https://gupolakeg.weebly.com/uploads/1/3/1/8/131871569/3231563.pdf
    • http://muvepifare.mygamesonline.org/noughts_and_crosses_free_download.pdf
    • http://kufafukedexepix.mygamesonline.org/ielts_speaking_cue_cards_2020_with_possible_answers_download.pdf
    • http://wiwovurezibaso.getenjoyment.net/igbt_vs_mosfet_vs_bjt.pdf
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/4012965.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pexodugosa/10974432542.pdf
    • https://uploads.strikinglycdn.com/files/e63265aa-3cfc-4202-a516-69b28ffb602c/7106748043.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_e9f23c54a3f647728974d3b8a7cf58f7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8c397a5f-9031-4d57-88eb-36b702b2fe32/boxitagofuru.pdf
    • https://s3.amazonaws.com/tidigudetefumof/arifureta_novela_ligera_volumen_8.pdf
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_8cbcb1ca631a4e93ac82661f78600623.pdf?index=true
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_111ac709168d4dbeb0529601235cd077.pdf?index=true
    • https://s3.amazonaws.com/gewuwasi/diccionario_biblico_adventista_completo.pdf
    • https://s3.amazonaws.com/sagotomagin/kirobanaxufewexetu.pdf
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_7e31837609d747978da5e75450fb131b.pdf?index=true
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_3d69f1faa01a47628486d7f0e6ad09f4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aed9807f-a3b4-473a-9999-6f9bfb61ce39/xakur.pdf
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_87f909b7860d42039495067e332c09d1.pdf?index=true
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_fd00e4b945b64df0befa02409aaa9581.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0457b39-a443-48d6-9030-e72e5bfb9f2f/what_oil_to_use_for_honda_generator.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_off0000c86a.bin
c565e5bd0ff47be9a17c4f99433b9ec74b0bb8690b7f4e621cc79e1613db915b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC86A 5164 bytes
font_01_sfnt_off0000da1e.bin
bbac2fb0eaa0e988eeb9f0d2067dd759d117e283ec65305bb8e00e132f793bcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 9396 bytes

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