Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc8f119bfe6523b…

MALICIOUS

PDF

82.4 KB Created: 2021-03-22 21:04:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42b5b90e80a3b378dcdde661c9aead77 SHA-1: b39f11310e98a8733f7ff5f854dba56ab39c7a98 SHA-256: dbc8f119bfe6523b728a52491076200cdb88d1fc4d9f70aa1a2e5bff8921d244
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 0.9992

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://golowaki.ru/wix?keyword=echo+show+5+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5fe836c5f25a6.pdfIn PDF document text
    • http://expressday.online/android_emulator_for_windows_7_for_pubgg6773.pdfIn PDF document text
    • http://maewallace.com/jusunikexizobapulan4gpve.pdfIn PDF document text
    • http://soul-felt.com/vorisuwm501p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5fcf34924cabd.pdfIn PDF document text
    • http://accface.in/android_version_samsung_s5_minil4miw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_5fd7d6c3a9f72.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/99491323065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388272/normal_602b3f8b29c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_60016b8598958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5fda3ccd914a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_6020979ae9d9a.pdfIn PDF document text
    • http://samettemiz.xyz/3904191675nxwg4.pdfIn PDF document text
    • http://helpcenter.business/internal_combustion_engine_book_by_v_ganesan_downloads26ne.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/cyberpowerpc_keyboard_keys_not_working.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_602f9c6ac14fa.pdfIn PDF document text
    • http://axacheat4.xyz/74656374465l5i4l.pdfIn PDF document text
    • http://steblin.pro/69832767178r4qdg.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/vuforewebub/jeopardy_theme_song_sheet_music_alto_sax.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/38496495502.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/kaththi_sandai_full_movie_in_isaimini.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/app_that_gives_math_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/classic_dungeons_and_dragons_character_sheet.pdfIn PDF document text
    • http://kopolug.myartsonline.com/pitoterigusevikimukol.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_off000105bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BB 5116 bytes
SHA-256: 1720e04593809cbaa4ef02e4427c1cc0cb63c857c28923f478d9ff0fa8a65adf
font_01_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 11024 bytes
SHA-256: dda035b3d35fb8d63dfe07a8440c6e2bf98c43707e5ca3b4e8f32d9889374e2c

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