Malicious PDF — malware analysis report

Static analysis result for SHA-256 9458878caa3137bc…

MALICIOUS

PDF

81.1 KB Created: 2021-04-02 02:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8fbc3a27e63b8b3dce955987e066e5d7 SHA-1: de318a02e568f3a5ad6ee5278cd3a782d4cdffeb SHA-256: 9458878caa3137bc6fe4f0cc449c0b1b428b22ae499dbae08f5ddf80a4172c02
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 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 0.9998

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 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://xezojetit.ru/strik?utm_term=top+ten+events+in+us+history PDF link annotation
    • http://useraisins.pro/what_does_kalki_means_in_tamil9le0l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476936/normal_5fe1040b2e4ec.pdfIn PDF document text
    • http://avit0.pro/jekozamolajebuzu2ed6k.pdfIn PDF document text
    • http://skameyki.club/vudobalbs9vw.pdfIn PDF document text
    • http://xeeewq.xyz/reducing_fractions_worksheet_grade_6seivn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378845/normal_603c68fd80cb8.pdfIn PDF document text
    • http://begetus11ppz.xyz/america_the_essential_learning_edition_second_edition_david_e._shir5fes.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/243328661342ootf.pdfIn PDF document text
    • http://instacopyrightcenter.com/badoo_superpowers_hack_apk_2018q8uto.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/inner_sea_world_guide_reviewpk795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_6004cf3e2b1bb.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/pokemon_lets_go_strategy_guidete0mv.pdfIn PDF document text
    • http://pshcomonhere.xyz/sports_illustrated_magazine_cover_posters2bodp.pdfIn PDF document text
    • http://tehnotop.space/daily_planner_template_for_college_studentsf8u8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_7ec8d4e6c3b04eb78aba544a21228866.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/747f5d4a-0d37-4cb8-932b-d99cb1cb8bc6/58092821199.pdfIn PDF document text
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_33716a0d0f724968a637a99f01d9c226.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_1815d044fbff47e989fdcfb5a5bd4a75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61649bb9-ec3c-404c-bbfa-e0be478761d1/guess_brand_logos_level_207.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_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 4776 bytes
SHA-256: 29a0e934b4dac989f142d861760170351d4c8895fdc48cbf2f4340ec2b550cb0
font_01_sfnt_off0001114a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114A 11240 bytes
SHA-256: 7e05061c164f63d1620639be299e1f3432e5197cd8c655a31d1751a823d02091

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