Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f30bafdba0306e…

MALICIOUS

PDF

94.7 KB Created: 2021-05-05 21:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7171f61612e253634c16e168df13195a SHA-1: df08ed504338a70b8af40d6a7d0c6339b6d630ad SHA-256: c9f30bafdba0306ee8ffc36da8416d5fd65dea255317b8c382b142e6aca8b921
166 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. It uses a password-protected-archive lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/strik?utm_term=what+is+the+value+of+young%2527s+modulus+of+steel PDF link annotation
    • http://neduxafeferik.iblogger.org/hieroglyphic_different_meanings.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/GAzkrij/mushroom_warrior_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/eghgfL1/woguwalisukepolofipema.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/jibuguvu.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/HMig6WB/68189457304.pdfIn PDF document text
    • https://cdn.sqhk.co/dewufidabo/ijiKhe2/lagexapelareda.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/6d86c4de-e5d3-40a1-9eb9-c4f8bcc70fa5/mudapetajipugoliv.pdfIn PDF document text
    • http://fepadegan.epizy.com/endocrine_society_prolactinoma_guidelines.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/organisms_in_urine.pdfIn PDF document text
    • http://durunorutap.epizy.com/fond_du_lac_reporter_archives.pdfIn PDF document text
    • http://xinirujoki.epizy.com/welixig.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/ecosys_fs-1135mfp_default_password.pdfIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_6c75c50deaef48de8130f1150d5ee45b.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_8e3d34f4b8714a10b94a86cf13b9e94f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e0364c-7730-4b41-a9b9-7d4293909657/the_secret_garden_movie_1987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564530e5-872c-4c90-b405-6b0c8589c471/vinarumizitipefamomore.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_c4fcdc5e4ca042a6a8faec66ab04f542.pdf?index=trueIn PDF document text
    • http://danijikuguwidak.rf.gd/perforated_stainless_steel_sheet_singapore.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_0f27e2a193fa4b6b9d315e0c76438f58.pdf?index=trueIn PDF document text
    • http://safowuroxowafop.epizy.com/bofalulewo.pdfIn PDF document text
    • http://sawezivolepusan.epizy.com/72170765835.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_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 5432 bytes
SHA-256: b202dc4c474e833acbbecab8cf3364a46d63cfe09a3fe7fa3b91166be640f531
font_01_sfnt_off00014498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14498 11908 bytes
SHA-256: 3160c2800792f8e6d166d165cec12b5516468d63079652a7648f6b8cf907edf0

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