Malicious PDF — malware analysis report

Static analysis result for SHA-256 a974af4e0189a2e4…

MALICIOUS

PDF

79.5 KB Created: 2021-02-28 06:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb6cb7f7776a8c235811e9456f19ee8 SHA-1: 7e9c0e1fc8d20fef6ccd9a6f33e263199f8e7827 SHA-256: a974af4e0189a2e41599e3c53aeb6c30f7771bb9f5392c6a6b197a6a7de1af44
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and the document's structure indicate an attempt to disguise malicious content as search results or legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://dugedepap.ru/strik?utm_term=majestic+gas+fireplace+dealers+near+me
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/465b9d8.pdf
    • http://reduslim-officialsite.site/samsung_tv_says_audio_out_optical61m5b.pdf
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fd6210644d85.pdf
    • https://kisobodowawon.weebly.com/uploads/1/3/1/3/131384145/234188.pdf
    • https://mixuzurul.weebly.com/uploads/1/3/2/3/132303374/nuwimufejuputunevoli.pdf
    • http://nizavevorupuj.mywebcommunity.org/best_one_year_bible_podcast.pdf
    • http://sepoxudozixo.sportsontheweb.net/91576897288.pdf
    • https://vanatajeto.weebly.com/uploads/1/3/0/7/130740174/b7a43db2.pdf
    • https://nejituxunexako.weebly.com/uploads/1/3/2/7/132712325/kerefevokazafixik.pdf
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/zemilemitupa.pdf
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/difajiwipijezebego.pdf
    • http://dawexefif.getenjoyment.net/bojack_horseman_season_5_episode_1_script.pdf
    • http://pipvip.ru/clear_cache_and_cookies_android_appgqhdl.pdf
    • http://daimontimur.org/26809052018tw3rb.pdf
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/demujeve_wagatig_guzemefa.pdf
    • http://sluzhba1.net/delonghi_pac_a120ex4ugg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lodanije.epizy.com/put_simple_past_tense_form.pdf
    • http://bajipelorisu.rf.gd/sopodena.pdf
    • http://nederanunotaz.rf.gd/essential_spanish_grammar.pdf
    • http://pakuvoxaje.epizy.com/how_to_replace_battery_in_kindle_fire.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_off0000f74c.bin
77fb7ae5ace92e5eae93561c3d86e379facec3f46f6509ab56dae50756e58dfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 5556 bytes
font_01_sfnt_off00010a2e.bin
dd315a5a91b0f7dac9823a6956a625c4917e220bb0491b9234a69ee346cd2e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 11124 bytes

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