Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe85b45a2a64e25…

MALICIOUS

PDF

78.2 KB Created: 2021-03-14 09:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: afe044e16c2b632ea13129c137e22ab0 SHA-1: fcf1be207e1344845bc0d8ef61b8715e27d7920d SHA-256: cbe85b45a2a64e257ab5d6aa0f8b2ccfca86dec6db0026a4972ee33911ecf75d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to various external PDF files hosted on disposable or suspicious domains, likely to obscure the ultimate malicious destination. The embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content under the guise of educational resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gimoguvi.ru/award?keyword=12th+class+chemistry+notes+pdf+free+download PDF link annotation
    • http://zuvixomajav.22web.org/42005211315.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/dgffghh/ping_pong_vr_table_tennis_simulator.pdfIn PDF document text
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/sivaf.pdfIn PDF document text
    • https://roxeviviko.weebly.com/uploads/1/3/5/3/135317288/81792d27.pdfIn PDF document text
    • https://cdn.sqhk.co/guwezasov/SVgeSOH/90027778331.pdfIn PDF document text
    • https://nurafotupitu.weebly.com/uploads/1/3/4/4/134495453/6995305.pdfIn PDF document text
    • https://cdn.sqhk.co/xodawakadude/jej7te6/siklus_hidup_fasciola_hepatica.pdfIn PDF document text
    • http://boputev.66ghz.com/vitamin_sources_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/tidapavibu/hfxJhhH/novowerasexoravupuxedo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_900e7fb293a940609e2adbc81cc866bb.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_d7369fb90752486b9f647dcf419e9d73.pdf?index=trueIn PDF document text
    • http://rukukuwozar.epizy.com/bits_of_paper_mp4.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_73a36a92949b46c7b7547909803fb257.pdf?index=trueIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_3cf37ea4e7784fd4a083dc5f837c39e4.pdf?index=trueIn PDF document text
    • http://kumobeba.epizy.com/7839452130.pdfIn PDF document text
    • http://finemadajurene.epizy.com/83187880204.pdfIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_4960a78e9bb04d75a5300db215833eaf.pdf?index=trueIn PDF document text
    • http://zitegarapopufis.rf.gd/accused_no_1_tamil_hd_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE664 5464 bytes
SHA-256: 0e42c13dfe8677dad5acdcfa2e3c8b09466eb1bded80c1258a61d5ef3603b35a
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10688 bytes
SHA-256: 0bc82ffc34c53d238c83451f7503b0628ce404f50dcc113edf2bc206b8c723bc
font_02_sfnt_off00011d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D44 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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