Malicious PDF — malware analysis report

Static analysis result for SHA-256 acf6f2d5b923c0e4…

MALICIOUS

PDF

70.7 KB Created: 2021-03-16 20:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 65097e1f568f8ec9d11df1ec78ee8249 SHA-1: d2e36f4f47e19854511e418503f2718bd3a75d08 SHA-256: acf6f2d5b923c0e4f8787325294a3462a0c215770da7d65b6599a010763192fa
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 0.9992

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://bologen.ru/wix?keyword=nier+automata+become+as+gods+achievement+guide PDF link annotation
    • http://vivekawiga.sportsontheweb.net/nalege.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/bemor.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/FpkZbhd/hockey_games_today_on_nbc.pdfIn PDF document text
    • http://buylettersonline.com/9839516514ov996.pdfIn PDF document text
    • http://musofiron.ru/78291653975hz0l7.pdfIn PDF document text
    • http://shishkin-seed.xyz/como_desarrollar_la_inteligencia_emocional_en_los_niosha4z4.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/2khfdVi/toden.pdfIn PDF document text
    • http://geosen.net/translate_document_to_chinese0sdby.pdfIn PDF document text
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/2b63f88d22e.pdfIn PDF document text
    • http://riwuvodobopexu.mywebcommunity.org/75064470062.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/b2b_marketing_strategies_on_social_media.pdfIn PDF document text
    • https://xuwukebi.weebly.com/uploads/1/3/4/4/134472968/1993071.pdfIn PDF document text
    • http://kieverts.xyz/maparutujaxuvopejusixa6z3s3.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/hhp0gK3/disco_zoo_unlimited_coins.pdfIn PDF document text
    • https://cdn.sqhk.co/gogamosujimi/JER9aic/ziresekijarivove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widofafane/how_does_text_structure_affect_the_texts_overall_meaning.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_2136e2f4d3df437d9266e584b97e1999.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/68106495476.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/new_play_store_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/vurezinusasijavupeviwonuj.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_726c662baf3d4e26b5e884f9cf709810.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_3fed0ae9785b401fb7ffd14da5ae84b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/mikozisikukegipalotipabab.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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 5492 bytes
SHA-256: fb2170f2aa9d76f56778ced7c3523e918348397a5214229b0f40c8236adb720b
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 10904 bytes
SHA-256: e362addc1c30963eae27b30c315b3c75ae22aebb8a3e2b2f0665b552b5651021

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