Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0135a0750305ca…

MALICIOUS

PDF

74.8 KB Created: 2021-03-22 23:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bfde50d5413516f3d5dea414f431594c SHA-1: b878adc0b4000b117fb78b466ec277225174d586 SHA-256: 1d0135a0750305ca0b0126a9904c6ded6d1dcb5638ebcec5f409ee4c2352e074
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://xajibur.ru/123?utm_term=firefox+for+android+4.+4.+2 PDF link annotation
    • http://kubosikavudux.mygamesonline.org/chick_fil_a_franchise_operator_application_process.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/lista_de_verbos_conjugados_en_ingles_y_espaol.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/famogulepugekojena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445118/normal_6015c220916a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_602a275807ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_5fe6c9598eff2.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/anemia_defisiensi_besi_pada_anak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_5fd8d24e96bb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_c7b406d611e54d6f963828d22992e365.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc90c351-3f41-43be-8c0d-37f2caee77b2/81425553219.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_8414e9ff34ff400982dc5b3411c81ba6.pdf?index=trueIn PDF document text
    • http://bototiluwoge.atwebpages.com/basic_english_for_beginners.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/81716348306.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_eb599d452606462098e8c1571c7e1f87.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_3d7d4d9dc678402da1b02f29706fd202.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_8efc1ecba41b40ec9498e23699e42499.pdf?index=trueIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/fimolupadaremo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4748f7cd-be4f-439c-81bb-7fe164af96be/what_does_lcsw_r_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1b958a-67a8-438a-b964-753b387e30ae/xetazalele.pdfIn PDF document text
    • https://c93ae04b-3d95-4128-ac62-0503c91a26e1.filesusr.com/ugd/002f5e_adb272e2a3b94d6aa98a687dfb1a3ab7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6a2b81-b1fa-4bda-b849-283153c3ce93/curious_george_books_free.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/the_alliance_system_lead_to_world_war_1.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_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 4968 bytes
SHA-256: 477ad4a6961be3681b405a70da946371782a39980a2d1df5ddebb1521cb93ba4
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 10972 bytes
SHA-256: 6b33674092fba59ad39df9ff5a8b15f7827bacd86883abbc6cb6087fd15e8272

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