Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9a7a2192826f95…

MALICIOUS

PDF

81.7 KB Created: 2021-05-07 13:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eba57d10b236dcbc2a3c94ffbee19bb5 SHA-1: 08efa9a437c3682e40cd5bde1dd7e4010c0be516 SHA-256: 3a9a7a2192826f955a6850cc35270c7f820b112ea286f3b5aafb180baff3e2ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identifies it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'day trading' and 'wkhtmltopdf', suggesting a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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://xezojetit.ru/strik?utm_term=how+to+practice+day+trading+for+free PDF link annotation
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/pefosagati_fulogijupovax.pdfIn PDF document text
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/dinegus_wijujoburididev.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/read_hunger_games_free_online.pdfIn PDF document text
    • http://tajumizigareni.iblogger.org/rikarirajeso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483388/normal_60503d08ccf7e.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/4610154515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_6052be6b6f568.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/calisthenic_workouts.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/sarcoidosis_uveitis.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/38156719649.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/joxasilox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_604cfbd8416d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_60298ecb306a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_600bb20cd8c29.pdfIn PDF document text
    • http://javaxirivibewi.mygamesonline.org/debitu.pdfIn PDF document text
    • https://lixesexe.weebly.com/uploads/1/3/4/6/134600642/2256530.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/fimadomime.pdfIn PDF document text
    • http://sukuwodexi.scienceontheweb.net/shannon_mathematical_theory_of_communication.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
    • http://fepufikegag.rf.gd/pesopivagipuzixagu.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/conversion_de_mililitros_a_pulgadas_cubicas.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/hallelujah_pentatonix_sheet_music_satb.pdfIn PDF document text
    • http://verafewema.rf.gd/ramemo.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/abc_tv_guide_australian_story.pdfIn PDF document text
    • http://lugifer.onlinewebshop.net/c_programming_loop_through_array.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/kuzubimudaroratukememuvix.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/14187058185.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/universal_genetic_code_chart.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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 5056 bytes
SHA-256: 9b875bba21e3c3ab35a68fb0477ce5f043014593cafa85434dff149366e8f048
font_01_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10964 bytes
SHA-256: 1f737bce7a314950828cb4816190438ef289183ed9af2781ce98313675750aef
font_02_sfnt_off00012a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6E 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176