Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16d6c146c2e4a1b…

MALICIOUS

PDF

82.9 KB Created: 2021-03-16 10:57:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4b1876f31ee675b25ce30f99363326ce SHA-1: 3dd7ed8a3b988563ac322bc3f06b973d19b8a7e7 SHA-256: f16d6c146c2e4a1b524887ad0c5931e04c36f2ff7ed5ea3337b3420036a556ac
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=unblocked+games+333+at+school PDF link annotation
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/lubobuxew.pdfIn PDF document text
    • https://zisojemikema.weebly.com/uploads/1/3/1/4/131483184/6394c95e7d617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412403/normal_60192f769fac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_602e4cd8af805.pdfIn PDF document text
    • https://faxarumi.weebly.com/uploads/1/3/1/6/131606834/a270bb49e6.pdfIn PDF document text
    • http://fumuponi.22web.org/lezagadexitatogipizofiwu.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/6xG3Ohb/hard_rock_radio_stations_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/batitiviz/gjj09ib/rolling_hero_2_cool_math.pdfIn PDF document text
    • https://cdn.sqhk.co/nomuzali/QojejcL/kezojalalilusisotis.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/022bfe9.pdfIn PDF document text
    • https://cdn.sqhk.co/lunexubafexo/jdyibjj/45307014271.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rinivuwuvo.epizy.com/are_slush_puppies_bad_for_you.pdfIn PDF document text
    • http://ferovugosewago.epizy.com/calculus_half_life_problems_and_answers.pdfIn PDF document text
    • http://kajebaneba.epizy.com/punuguv.pdfIn PDF document text
    • http://sosibozipez.rf.gd/kenmore_washer_model_110_owners_manual.pdfIn PDF document text
    • http://bidasumibave.epizy.com/business_card_design_templates_free_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4ab904-7d34-497a-b8c8-bffab5f0af9e/operating_system_not_found_windows_10_after_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0c127e-8419-4010-b55a-1716b99f8366/woromegimapudunasivaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e8481c-21ec-4a3d-962b-02c204b6cbbf/how_to_program_x1_remote_to_vizio_tv.pdfIn PDF document text
    • http://gesovupa.epizy.com/21617049468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87f80781-01d4-4aba-bdad-51fb746d3869/klx_110_pit_bike_for_sale_near_me.pdfIn PDF document text
    • http://sezusin.rf.gd/how_should_covid_19_be_written.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_off0000f481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF481 4484 bytes
SHA-256: 6e25bbcae505470dc56ecac18206ae9a1089d9f2fe03a7414f5be2b75004f45e
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 5616 bytes
SHA-256: 0909f02f46c75d91bce9c45ad4cc51d7c7a54ceddd994be415891f1c4697f777
font_02_sfnt_off00011773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11773 11372 bytes
SHA-256: 6c038bad54fd09a27d34d67cbe92eb8996111898639ef4eb274a5412164aa51c