Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a8d781632ceafa…

MALICIOUS

PDF

76.3 KB Created: 2021-05-14 10:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b66f3efa7db8f1f74c9cdaa578353b1a SHA-1: 22dc4921d6a9d24ffe34e49ff65fac0907ab94ee SHA-256: 51a8d781632ceafa91877f4f7aefd02efd3916840dcd7d07d24b8f789771543e
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one that appears to be a redirector with a search term, suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=what+is+the+best+coding+language+to+learn+in+2020 PDF link annotation
    • http://lirebuwoke.mygamesonline.org/asme_b31_3_free_download.pdfIn PDF document text
    • http://freshka.fun/4275645867vvgqx.pdfIn PDF document text
    • http://ronefed.iblogger.org/mufixulemedejubivob.pdfIn PDF document text
    • http://cesaregaspari.com/vitozipetimexivomogahkk.pdfIn PDF document text
    • http://medyayazilimtr.com/how_to_open_midi_in_garagebandr0765.pdfIn PDF document text
    • http://pedakuf.22web.org/52202408320.pdfIn PDF document text
    • http://vashastrahovka24.ru/pmbok_guide_5th_edition_freed5m2r.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/vetowutobupufesulolikiboz.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/all_electronic_components.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_samsung_tv_firmware_update.pdfIn PDF document text
    • http://doweryklkq.space/91519979077df5w7.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/definition_of_time_series_analysis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soxerufazele.rf.gd/how_do_i_connect_my_projector_to_my_phone.pdfIn PDF document text
    • http://wofenexofube.rf.gd/beneficios_de_la_zanahoria.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/cheat_engine_6._2_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/sorunonefiripupoliroxoma.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/makozitedumorofojepa.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/minna_no_nihongo_kanji_1_english_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5eb044-a684-489e-bf3a-929718324227/husqvarna_snowblower_belt_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd071bf-0c73-4917-9f71-57606ef4ce14/how_can_i_tell_how_old_my_marlin_model_60_is.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/our_bucket_list_adventures_a_journal_for_couples.pdfIn PDF document text
    • http://biborufa.epizy.com/231066032.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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 5628 bytes
SHA-256: ec868526062a8d2ad0ce7690738f07cf68ebcc88319ccbba05133b1e525342aa
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 10676 bytes
SHA-256: 722a92c4ed6d24d327b6f03f0e5e082725b456da545a36b03ff2b79361335e23

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