Malicious PDF — malware analysis report

Static analysis result for SHA-256 019b3e1158a4e28b…

MALICIOUS

PDF

74.4 KB Created: 2021-03-21 23:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 85ea80851ae0025c9fbbf3f88d44ab92 SHA-1: e4ac3ee66c4278a90204a7477a0c812fa8194b21 SHA-256: 019b3e1158a4e28bc20384300161c052f04e178dfa36f61d691c65d6c03f3330
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. The presence of external URIs and the link farm heuristic suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=west+valley+flying+club+instructors PDF link annotation
    • http://kunujunekedi.mygamesonline.org/small_and_large_intestine_anatomy.pdfIn PDF document text
    • http://health-top.ru/estudios_de_caso_psicologia_laboralk1q0s.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/lewivokud.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/jedowowujorunulivi.pdfIn PDF document text
    • http://ibkreactiva2020.com/nonesawuk67y38.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/1944135499.pdfIn PDF document text
    • http://lotto-investclub.com/52876356369bnuct.pdfIn PDF document text
    • http://reestr.site/carbon_democracy_summary7etj1.pdfIn PDF document text
    • http://vezerfa.xyz/should_a_pregnant_woman_work_during_covid_19nxehf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/alphabet_writing_practice_worksheets_for_kindergarten.pdfIn PDF document text
    • http://wugetad.myartsonline.com/causal_research_design_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262e563e-eb71-42ed-bc01-965763ce8b33/7537047582.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6db3bdf8-5da7-4f94-90d7-9c1aad9ae910/lifehacker_best_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/best_os_for_pc_2020.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/69047061930.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/tetajof.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/94858471228.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/83026013015.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/godas.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/generic_property_damage_report_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a2a4f5c-9212-4f20-b519-e2853eb3311b/47944526314.pdfIn PDF document text
    • http://jiwodiw.myartsonline.com/applied_physics_btech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3709d27-cb80-412f-a9d2-9056c13d7217/56326902817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97ad0ac-3cb9-4206-a667-f49c7e32f701/can_you_sell_pictures_of_your_feet_on_only_fans.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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5364 bytes
SHA-256: 9fc3d412bf7831b12af58a2e3aab23acbada7817cfd320c74e74a6463ed9f754
font_01_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 11460 bytes
SHA-256: d5f1a318929bdf0a13c647043e01eb54df000b1a9c614dcf323e26657be9eb84

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