Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c64fc72c8489be9…

MALICIOUS

PDF

74.2 KB Created: 2021-03-19 12:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 923cfc33c4c80420383afd284bc89b12 SHA-1: 123f9bdbefc4781916dcc1db5ee51f3144f95412 SHA-256: 8c64fc72c8489be9c77ca20f84bcb326aae94e7e1ba3230fdbce7135412e7744
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, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://nipisod.ru/strik?utm_term=what+are+easy+songs+to+play+on+ukulele', is likely used for phishing or to host further malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=what+are+easy+songs+to+play+on+ukulele
    • http://intekzafast.online/4954072412dvkim.pdf
    • http://qupieasy.online/zedolinupudagegalimee93g7.pdf
    • http://kixorita.22web.org/centos_6_live_cd_iso.pdf
    • http://rowifir.22web.org/padded_portacot_sheet_baby_bunting.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_b2803d31b5e545ecb83e87ff667cf430.pdf?index=true
    • http://zukavinu.rf.gd/metformina_sin_receta_mexico.pdf
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_151f6bc378c24bd4b401a36f8df56de6.pdf?index=true
    • https://50e0a74f-e7a5-4ac3-a7a6-4cdd7b1ad00e.filesusr.com/ugd/8a9d9f_041a9c05057d478299edb7a8429a66d2.pdf?index=true
    • https://s3.amazonaws.com/mibiwivanetuj/starcraft_2_heart_of_the_swarm_campaign_cheats.pdf
    • https://uploads.strikinglycdn.com/files/db082b28-a1db-4b64-bbdf-d49ec79bf9d2/calculate_unit_product_cost_under_variable_costing.pdf
    • https://s3.amazonaws.com/vuzotisenixava/music_notation_worksheets_free.pdf
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_f7c4612e716c42aea31ffb101fbb8845.pdf?index=true
    • http://forawoxo.epizy.com/srimad_bhagavatam_malayalam_free.pdf
    • https://uploads.strikinglycdn.com/files/fa6f34c4-3f1f-4d26-8824-2954a8f9b05c/traditional_animation_for_beginners_book.pdf
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_88dcd316ab734a4ead340330d5db7c02.pdf?index=true
    • https://s3.amazonaws.com/fekazudabo/unity_adam_tech_demo.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_135dba7866c14b019eed19867b5478c8.pdf?index=true
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_742164c74e2c445db742cc3ddc20a44b.pdf?index=true
    • https://72be5e1b-4d14-4335-96ee-88463f604c48.filesusr.com/ugd/57ecfe_0e802c8bc5374f608c398ae1da920892.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_off0000e43e.bin
177b154ebb6a3e5706f3bbbd9dee43947ccd88f3ec2c9e01f45a2ae85cb8573e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 5260 bytes
font_01_sfnt_off0000f634.bin
cab97fbe014e2ea44a114f44fcdfab378dacdd4fd24071d670151b7671842cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 11104 bytes

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