Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef800ae6a1b5e6c…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 18:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5356e75a73af9d71f7890857ce9fbe12 SHA-1: 158da2dc7a1b873f9874ad8a45378bf5f668cbe8 SHA-256: cef800ae6a1b5e6cbd1389c6ebd080c22e26aa8d5aef4839c764c642ffa0c804
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://crophysi.ru/wix?keyword=descargar+musica+nueva+2020+gratis PDF link annotation
    • http://myluckybet.xyz/prescription_safety_glasses_frames_onlygvjwg.pdfIn PDF document text
    • https://notilapixoto.weebly.com/uploads/1/3/4/3/134397855/luneri.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/VmJSjfL/tuvumunavipugawasoxa.pdfIn PDF document text
    • https://pulapafux.weebly.com/uploads/1/3/0/8/130874232/gexokix.pdfIn PDF document text
    • https://cdn.sqhk.co/rubovadu/ghicgqo/brave_frontier_tilith_character.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/milegizo.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/P4xrigh/raid_shadow_legends_characters_to_keep.pdfIn PDF document text
    • http://kogejirupu.getenjoyment.net/barreras_de_la_comunicacion_interpersonal.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/dunopupilipogusuw.pdfIn PDF document text
    • https://cdn.sqhk.co/zefipuvuwifi/AEibkgc/vowizaxivedulojuzuwewud.pdfIn PDF document text
    • http://websporizlehd.com/game_of_thrones_season_1-7_download_redditzue6g.pdfIn PDF document text
    • http://pedrons.space/39877917082ojpcx.pdfIn PDF document text
    • https://rapaxexujimina.weebly.com/uploads/1/3/1/4/131454932/kamodelako_dulemulafarer.pdfIn PDF document text
    • https://fizozedodid.weebly.com/uploads/1/3/4/4/134484686/jipugowitigati.pdfIn PDF document text
    • http://ig-supportcenter.xyz/biotechnology_questions_and_answerssitoz.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/atlas_of_electrocardiography_wang.pdfIn PDF document text
    • http://myyshooop227.site/half_yearly_exam_2018_chemistry_answer_key5n20c.pdfIn PDF document text
    • https://nufewaxitobazat.weebly.com/uploads/1/3/4/7/134748461/c519d70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://winimoviwimi.myartsonline.com/xaxapazozajabetabiwemabiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a047cd-5c1b-46d4-bfa1-55a50c74eba0/salter_led_display_digital_kitchen_food_scale_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddf1c27-22f4-4bab-8eda-2a3bf67efbd6/lifetime_44_portable_basketball_system_assembly_instructions.pdfIn PDF document text
    • http://kulebosux.myartsonline.com/house_on_mango_street_soundtrack_project.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e293dc9-62ee-43ae-bab0-807c2be8391b/epson_workforce_wf-7510_all-in-one_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bc5454-d02e-40bf-bb1e-8e3bf7b66053/wasopoluwosutot.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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 5420 bytes
SHA-256: aa79710cab3481e022f1d9c1c73df933a4d98e043446f329c88e5769bc083011
font_01_sfnt_off0000fe53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE53 11756 bytes
SHA-256: 0da1960ece93205be5ac55bdb1885530cfa7b843d3f89da7e4f938d1e564331c