Malicious PDF — malware analysis report

Static analysis result for SHA-256 855dcab232a40885…

MALICIOUS

PDF

83.1 KB Created: 2021-03-15 02:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 97c33dd9eb5b15fc72ab556bfa19ed6c SHA-1: 2beed2cf9c25320089c88a2257049c05b5355958 SHA-256: 855dcab232a4088537cb6dc898ac460cdeeb71734d01bbd64d29198acf17b38b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains embedded URIs pointing to external websites, specifically `https://seumenha.ru/award?keyword=early+child+education+pdf` and `http://metazoaapc.fun/40437053646sk1ab.pdf`, which are likely part of a phishing or malware distribution scheme. The PDF structure suggests it's designed as a link farm on disposable hosting, aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/award?keyword=early+child+education+pdf PDF link annotation
    • http://metazoaapc.fun/40437053646sk1ab.pdfIn PDF document text
    • http://fragcups.com/37437217772mhbvz.pdfIn PDF document text
    • http://hookup750.website/aprilaire_800_humidifier_installationxxzk4.pdfIn PDF document text
    • http://ig-soft-team.com/wabidikodokosisexasirojamsss2.pdfIn PDF document text
    • http://pitikudefojeken.getenjoyment.net/50881371633.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/riwukukurupafupuweki.pdfIn PDF document text
    • http://4kuhd.me/vocales_para_imprimir_preescolarzjcwg.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/zorudab.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/winuzatif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_667fea96395b4c1f903da5e64cdc3123.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/478fcce5-eea7-4fb2-a7c1-a4dd85a56f38/57267908405.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/guxiputok.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_d2a289f74d6d4b75a4f60d9303f58d04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea712779-5ae5-4ae6-8364-221ba3d0b265/compare_apples_and_oranges_meaning_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a09e982-ace0-4eee-9a2c-a5b93085cb88/67623009707.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_a40e9625f1304224af27a3a1584aafc6.pdf?index=trueIn PDF document text
    • http://tisavan.onlinewebshop.net/moviwewofizovuxinetata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2ce063-3ec6-414e-9f3f-1c943dcdc6af/maui_police_department_non_emergency.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8580ea5f-b9d3-489d-b647-c02557e77954/viper_7856v_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/public_finance_and_public_policy_free.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_d99884eb8e854635ab8744606e798c47.pdf?index=trueIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_9aed918619334d4a93967ca8509492be.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_09f248103c134c499d46bf7d9f044299.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_off0001068f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068F 5124 bytes
SHA-256: adcf902ce1ae36c4a638dc2d3a558bc9f729f5c3ea1d99b019d16063fe507f65
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 11512 bytes
SHA-256: 1b04fadec678d0a0c58af5be3182224316202c1674b928b872b39092984a06a2