Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac792ba6dd3e9a1…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 04:06:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4174ab15e25e7330b57e0c8f6d58de0e SHA-1: 36cd6e55c0b3202f238736b28ede7b96478b1260 SHA-256: cac792ba6dd3e9a11ddf88f7526b934fa3e80b603344e1daa1fd8cd0b442963e
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 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

  • 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.
  • 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://pelibifir.ru/wix?keyword=envision+math+grade+3+workbook+pdf PDF link annotation
    • https://jamofavoxaf.weebly.com/uploads/1/3/4/6/134698870/319635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6018d7889e80f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_604ae28c178a1.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/eb86bc22d7e3e.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/vivudewum.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/2007_jeep_grand_cherokee_crd_oil_capacities.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/baramulla_bomber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5feb70457a44d.pdfIn PDF document text
    • http://xajabuzowa.scienceontheweb.net/behavior_modification_textbook.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/e095261b-c153-496a-9ae6-cf9a09720817/how_to_connect_two_block_rockers_together.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_a86181259aac435fac014198eb751be9.pdf?index=trueIn PDF document text
    • http://xufoziminep.onlinewebshop.net/16196767069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f88363-4b45-431f-8527-ca2f9aeebe57/how_much_does_a_replacement_tooth_crown_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f2df64-48b9-4f77-8335-98482ebe49e0/lezowav.pdfIn PDF document text
    • http://fonisojodivese.rf.gd/962471999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe476c5-7251-4ee9-bfba-0785a7a49503/how_to_start_a_vegetable_garden_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6dd2ab-c66a-4f3c-9954-4c71a3a80967/uk_and_us_english_words.pdfIn PDF document text
    • http://gedonisezif.epizy.com/fevogew.pdfIn PDF document text
    • http://fakadigat.epizy.com/93813140267.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_1358234d2a304c9a88d51f7d226b6554.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_61c2bfa6add5450e96f64c634d7b26c6.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_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 5900 bytes
SHA-256: 3bb737a5a744b410dfbd3cc9e5a72da1557f67c87a7fe25439d7718530ecfaba
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 10816 bytes
SHA-256: e536ac9f760f2640f9c61a6f455378891ca9647dd41375abc5f5ac887989967f

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