Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5542b75462b092…

MALICIOUS

PDF

79.5 KB Created: 2021-02-28 15:28:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83065177bb3bb6668d5f9b4a83b0d43f SHA-1: 92e2fd83f8c05e2e62c4ef3bc78f6a7b078f20fd SHA-256: 3a5542b75462b092b2733a2dc0a5cb777d6d9f41b681f87cfcc69c93d7acc54a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though truncated, suggests a lure related to health information, which is then used to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=para+q+sirve+la+curcuma+con+pimienta+negra PDF link annotation
    • http://bokugezus.66ghz.com/luretolalezavirati.pdfIn PDF document text
    • http://libralab.digital/east_hartford_ct_police_reportslcqnd.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/uijR8hD/44999208718.pdfIn PDF document text
    • http://iminn.ru/38845609306sfre9.pdfIn PDF document text
    • http://erogancolumbia.site/nikodubenulagijifeliwoq4vda.pdfIn PDF document text
    • https://cdn.sqhk.co/jezumasulej/hw7idgj/sim_card_toolkit_unlock.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/math_expression_worksheet_5th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/9TifGjb/n64_emulator_online_multiplayer_android.pdfIn PDF document text
    • http://shoop-fh.ru/wen_56200i_super_quiet_2000-watt_portable_inverter_generator_reviews17j19.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/75849667223.pdfIn PDF document text
    • http://neojust.ru/why_isnt_my_ue_boom_2_chargingidhmh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_60249cbcda3a8.pdfIn PDF document text
    • http://wijulewotolag.22web.org/2011_mazda_3_gx_owners_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/icGhcgh/tijisazozokixamobopuzuso.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://dezinolabebosod.atwebpages.com/zomel.pdfIn PDF document text
    • http://gafibis.epizy.com/staples_paper_shredder_lubrication_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/barwell_infants_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/because_you_loved_me_ringtone.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/timothy_ferriss_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/mulorojuvunivovuzedi.pdfIn PDF document text
    • http://zopujozeze.rf.gd/first_aid_incident_report_form_ontario.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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 5320 bytes
SHA-256: 5b1ed0a4c0784f3ef8a710af09bf36348fa165e620eeffa294dc9a9d6dba3d63
font_01_sfnt_off0000fbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB5 11420 bytes
SHA-256: fd934b94453e23bd5acf385acaf4ff2f7c64dc299b9c9ae4f68f536c366091d3
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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