Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b816ea70ff5f9fb…

MALICIOUS

PDF

83.5 KB Created: 2021-05-05 23:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b1e8bdc1f0aeb1a5f26f77942b8d6d4c SHA-1: 64905ad6ebcd4d6ff04c60451d9bccf171b32918 SHA-256: 0b816ea70ff5f9fbb880f18e3e4f1b5c9151e6c10cae6bfc646b445c9942e480
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to connecting a Fitbit device, likely a lure to encourage clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=how+to+connect+a+fitbit+charge+hr+without+dongle PDF link annotation
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/xapotegupeke.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/fokekuf.pdfIn PDF document text
    • http://qwertyujg.xyz/jotoft0gk4.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/88863057076.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/dokaxemilubo.pdfIn PDF document text
    • http://blockhcain.host/netis_wireless_n_range_extender_setupaka72.pdfIn PDF document text
    • http://refazali.mygamesonline.org/romanesque_architecture_in_italy.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/calibration_curve_of_paracetamol.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/6415888.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxewun.rf.gd/duzokowajuloxefabesonud.pdfIn PDF document text
    • http://pupovedifa.rf.gd/bowlers_journal_ball_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/biranak.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/kofinuwuzavuredode.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/nys_court_officer_test_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/muxuf.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/54853478054.pdfIn PDF document text
    • http://pizenusogusu.atwebpages.com/reduce_file_size_upto_100_kb_online.pdfIn PDF document text
    • http://kugogawi.rf.gd/25600098387.pdfIn PDF document text
    • http://jiwodiw.myartsonline.com/bncc_educao_infantil_em.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 5300 bytes
SHA-256: 7c0e0973d3ae7342798f0df8f3a126ee646c02734a78b663b443d736a612de1e
font_01_sfnt_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 11784 bytes
SHA-256: 9a445719405fec4343f89d1432fa10da9075d0c080167c39de609c131f215541

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