Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8cca1b7fcce304…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 10:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 580c59add4dfed7f4e196e93f8487832 SHA-1: d48c0fb641b2f03887de6aec4454ad510ee4a795 SHA-256: 0f8cca1b7fcce304964df5133cbb6e7e09d9d346b7295e10a0748ecb747660b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs, 'https://xajibur.ru/strik?utm_term=que+tiene+sodio+y+potasio', is suspicious and likely leads to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=que+tiene+sodio+y+potasio
    • https://cdn.sqhk.co/mikitikotak/pLhaiiG/tomanufes.pdf
    • http://vladport.ru/69332152887xdh52.pdf
    • https://cdn.sqhk.co/fukafodifi/cawhcjj/chicken_invaders_2_download.pdf
    • http://idealslim-ordina.site/75053484647yfq2.pdf
    • https://cdn.sqhk.co/gakilofod/AijQjcH/air_traffic_controller_strike_athens.pdf
    • http://immortal-sho.club/jomababimowulf32.pdf
    • http://salea.site/what_method_does_philosophy_of_nature_adoptj5784.pdf
    • https://cdn.sqhk.co/bovutolomevo/TLhiggC/roundup_quick_pro_mixing_directions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nojemi/55941597374.pdf
    • https://s3.amazonaws.com/nokiva/michael_vey_4_summary.pdf
    • https://uploads.strikinglycdn.com/files/9c0b19a4-6f86-4b84-960e-6cd4cdef3878/ensayo_de_la_carta_a_garcia.pdf
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_21056493baf549e68b3ae998b0634abc.pdf?index=true
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_74a8e55c921e4d78a63218df3f41f375.pdf?index=true
    • https://s3.amazonaws.com/wujodibu/jefigabizamuzuf.pdf
    • https://uploads.strikinglycdn.com/files/132f9bb6-eff1-4b4a-9392-bccdbad73770/how_to_install_scansnap_ix500_on_windows_10.pdf
    • https://uploads.strikinglycdn.com/files/f17a1c21-0f05-4f21-8523-5a36c94b2136/gujevinem.pdf
    • https://s3.amazonaws.com/fopalew/twitter_hd_video_er_app.pdf
    • https://uploads.strikinglycdn.com/files/60dc4101-b287-49c0-a975-58bca13b2a62/oregairu_light_novel_download_sub_indo.pdf
    • https://s3.amazonaws.com/gorajikunobixi/nabafe.pdf
    • https://s3.amazonaws.com/vojapu/roraxe.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_off0000f929.bin
c4466e9f1c7c53db7e28e16e4f0399115c792570788c240dbb8edc99f20c3c10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 4988 bytes
font_01_sfnt_off00010a39.bin
11adfbb7d335eece3abf53d13e7a3700c67ef0d79619c6fe1f0e1fbce165c681		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A39 12764 bytes

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