Malicious PDF — malware analysis report

Static analysis result for SHA-256 de965a2a9d81346d…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 19:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 765690b8e00f1e7700952ddcea75d6cc SHA-1: 1a545b0ead374f4dc8e680db50c877a5215051d3 SHA-256: de965a2a9d81346dc4b7d490a36d0107c3ef541bb877fb81226d49dca7a5d484
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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.
  • 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://nipisod.ru/strik?utm_term=what+does+my+name+kinsley+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413467/normal_605be088138a4.pdfIn PDF document text
    • http://zesamoa.online/abacus_maths_books_answers8ano4.pdfIn PDF document text
    • http://community-day.ru/21375568524e33vl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_60188629a8669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_603b462fa63df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_602b88ca43a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_603cbcb4169b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c3b008-5d2d-4b79-9fe4-4619a610f214/sword_art_online_alicization_war_of_underworld_season_2_op.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e50641c-090e-47a4-87bc-6c3928829dc9/nukefepufef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6911d217-ccfb-44c1-be4b-cac5e318c4d9/what_is_the_difference_between_atari_flashback_8_and_9.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b9d2d9-460d-4c25-962c-4accd85b0dbb/probability_density_function_pdf_and_cumulative_distribution_function_cdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6df21512-48f4-4e61-90ea-04fa77838d25/xewizeputobisufadudupas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2d7957-8652-415f-9eb6-708a458ac51c/blink_book_amazon_uk.pdfIn PDF document text
    • https://3211d54f-29bc-45c2-8691-939fa64f7450.filesusr.com/ugd/2e34c2_999cab15c6f44771b4b8dda5b9557542.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc7f83d-1af3-4471-b9f7-9164b3c752ec/metric_system_worksheet_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7657f5ef-05fd-4180-90b3-e59453ac46a7/zudifevubixabawenupumifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212d34ff-a3dd-4551-8716-09fd64bbe473/49251822867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc2364a-36e0-4f2c-a1bd-f5857ebffe6a/sogino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d113789c-1fec-40e3-9a79-69f1efe92cee/does_vitamix_have_a_food_processor_attachment.pdfIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_912685a2f7fd4c63bcfbf555edddcff3.pdf?index=trueIn 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_off0000eb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6C 5148 bytes
SHA-256: cb0c4c8d578e4653602b6ccfa547bdfd5f8bea0d2f4247e9ae30ada568d75e9b
font_01_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 11528 bytes
SHA-256: 56e394ac5a985d629b7bdbef763d2c0eee0109e378f5e651f04e53212323f8f4

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