Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cad98084a8e7798…

MALICIOUS

PDF

77.1 KB Created: 2021-04-03 04:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e76d4405860257cc6fab46d1e85c1bfa SHA-1: d7ea8cee83238431bb39357eea995d2ca8d02299 SHA-256: 4cad98084a8e77989215f989f62d448dfffe44267cab7c6eb6f0ba7648130bf8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URLs, 'https://leonvi.ru/strik?utm_term=medios+de+comunicaciones+que+existen+en+el+mundo', appears to be the main lure. The presence of PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS heuristics, along with ClamAV detection, strongly indicates malicious intent, likely related to phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=medios+de+comunicaciones+que+existen+en+el+mundo PDF link annotation
    • https://cdn.sqhk.co/pobumepova/hebaqiI/carte_de_recharge_pcs_c_est_quoi.pdfIn PDF document text
    • http://ru-payment.casa/xotopacszpz.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/jjeJIQK/foosball_air_hockey_pool.pdfIn PDF document text
    • http://domastmsk.space/word_scramble_worksheets_softschoolsm8hag.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/19a0f21b-0c0b-4eea-a4cc-c92f0e3dc28f/toshiba_regza_42hl167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c68a0d37-5a10-4b18-b928-b3db423e9262/zte_valet_headphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3059b2af-525e-4196-8688-f200911c3aae/tewudep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d24b9cb-0c96-4499-a114-3973a4a56a7a/schwinn_bike_trailer_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/mogulinanigipoju.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/hadoop_the_definitive_guide_fourth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e9a7ef-6fa4-49e2-9481-dc1e3754520c/toxukamulamalulifijusi.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/how_to_put_vinyl_decals_on_glass.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_d840c45e12954b9c9103d0033a2ab86f.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_809f428c346444bbbe62ae40f5718c70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2f303ce-492f-4539-bc4a-75b465669c77/the_man_in_the_high_castle_trailer_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1c0e4d-f472-404e-a137-babb3b9f5e5c/dusux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b981cfa-73c5-4a18-a802-b7eed8c37eee/biomedical_engineering_unsw_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/aripiprazole_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/what_kind_of_smoothie_can_i_make_with_spinach.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_off0000ed29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED29 5188 bytes
SHA-256: bc9ca530cabe5d1134087894ba2b5bba6c9a0cbc33bc173ebd4a7e66bb0d39bb
font_01_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 11704 bytes
SHA-256: 9c11a5a6d6b7f692a50e66fe5b08eee353bb63aa6ced44b67a257a91b8fbc54f

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