Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bc5a128ca1575c…

MALICIOUS

PDF

70.1 KB Created: 2021-05-09 17:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 391171bc8c1c83d73356be38a44e7e41 SHA-1: c96b77173a5944535d0a462b611351663256d4e0 SHA-256: 10bc5a128ca1575c1ed3ac5e306008b2449d06237fa756165a28619b8aa0e2c1
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=motorola+elite+sliver+3 PDF link annotation
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_601a0ef78f509.pdfIn PDF document text
    • http://xedijama.getenjoyment.net/acls_provider_manual_free_download.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/auditing_notes_bcom_3rd_year_in_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461523/normal_600784a5e59d6.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/nKeu2jc/recargas_saldo_gratis_claro_argentina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416510/normal_5ff97c7c3a44d.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/kofaremunepaner.pdfIn PDF document text
    • http://cozyplacefor.rest/nuxetomavatazubhkxvy.pdfIn PDF document text
    • http://carinsusa.com/rodugerabifebonu6gw9y.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/gjhgSjf/keep_away_godsmack_live.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/jehjif8/neon_green_hockey_tape.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/ic6B5if/85046354650.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/9jfVRjj/cube_surfer_game_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421787/normal_5fc9ead781582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_5fcb6999e6824.pdfIn PDF document text
    • http://brumbum2.xyz/410289112555c2c5.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/Q5rNgex/let_s_go_planetshakers_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_604e27290d183.pdfIn PDF document text
    • https://cdn.sqhk.co/tinawegu/eCiPjgc/hr_metrics_dashboard_excel_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femagela.myartsonline.com/short_story_book_english.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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 4908 bytes
SHA-256: a790cbb14f85d5a9e102f85cf937bab1683918b0b219644a7947d4991e5d8748
font_01_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 10624 bytes
SHA-256: 54ed153e478afdd748ba2d8c32f9636e8d5413a4928edacca5f7b664f7aa0158

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