Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b9888b6185810f…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 02:25:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 24ddbab1ab27f30d34de1fc348e876d3 SHA-1: ed34d5c525a764190bfba5b59ecc2d42f5dffc5b SHA-256: c6b9888b6185810f84870a2e50978dc30a568d7dbbd96c4a4de29828166c3fcf
126 Risk Score

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://golowaki.ru/wix?keyword=pdf+aristotle+and+dante+discover+the+secrets+of+the+universe PDF link annotation
    • https://cdn.sqhk.co/wajerewuwer/yifVcic/69882679797.pdfIn PDF document text
    • http://dorightschool.com/awge_dvd_30kvlp.pdfIn PDF document text
    • http://dvestideyli.xyz/invitation_to_the_life_span_3rd_editionc4hod.pdfIn PDF document text
    • http://bigchance.pw/titulaciones_de_neutralizacion_acido-basennsmr.pdfIn PDF document text
    • http://maritimog.medianewsonline.com/bv_ramana_engineering_mathematics.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/balance_sheet_proforma.pdfIn PDF document text
    • http://trydouche.xyz/29658770803dhe6h.pdfIn PDF document text
    • http://24goodstore.site/aztec_ball_game_informationn0tsw.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/67507023878.pdfIn PDF document text
    • http://1xbet-registr.site/46892893059pwebi.pdfIn PDF document text
    • http://kind-insta.site/bulezemujo7a0u9.pdfIn PDF document text
    • http://xbet1.fun/watch_desert_hearts_online_free3wnpa.pdfIn PDF document text
    • https://vanuvinuvur.weebly.com/uploads/1/3/0/9/130969573/9841041.pdfIn PDF document text
    • https://xowimigijik.weebly.com/uploads/1/3/1/6/131637135/vexixe-xojifuduta-ligigipofum.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/jdBhehc/stick_war_legacy_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/LwN8Via/cinema_box_app_for_android.pdfIn PDF document text
    • http://ehaberdevlet.com/john_deere_345_snowblower_installationpvvp5.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/madame_bovary_quotes_explained0duw4.pdfIn PDF document text
    • http://idealsit.fun/zarazugufadasorojiwubuz92mhn.pdfIn PDF document text
    • http://zoneeuro.pro/how_to_bypass_an_ipod_activation_lockr8oxx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 5168 bytes
SHA-256: b2678775b6b40c4ef05a889306067e39babb0f095f51ab30fe7911436d3d4692
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 11384 bytes
SHA-256: 9ee05b72eb579ae543614f61fd3c010c6b2fcdbd179f42f6c24782fca1c568f9

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