Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9e303bd32bdc2e…

MALICIOUS

PDF

81.3 KB Created: 2021-04-01 15:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4c48215c7c97b539d2b29c6f687304f1 SHA-1: 54315d1eb96034ea5dd3c2cb4763a5780821f3f9 SHA-256: 1c9e303bd32bdc2ea6c3da3d1a1ef3df477f78090fb587214ef1e3bb9f944ece
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=northern+kentucky+athletic+directors+hall+of+fame PDF link annotation
    • http://azules.ru/airtel_dth_packages_downloadt6shr.pdfIn PDF document text
    • http://teaapple.space/what_is_the_main_problem_in_flora_and_ulyssesaaypq.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/jPfggih/lanuroreruzilavageve.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/Viehehc/zodepajek.pdfIn PDF document text
    • http://yoga-italy.space/sage_50_premium_accounting_2017_full_crackedgf28v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5ffffacf9de44.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/5tFhejh/71045960975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_603ceef5aec23.pdfIn PDF document text
    • http://cashtanks.fun/64708286073lkbk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459170/normal_603b672193c96.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/c2cifhd/starry_sky_go_launcher_themes_free_download.pdfIn PDF document text
    • http://gamedv.design/super_smash_bros_nds_rom_hack5xl47.pdfIn PDF document text
    • http://copyrightproblem.com/paradise_island_tv_showwop6m.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/hche0Yx/where_to_buy_dragon_ball_z_energy_drink.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/BKgeARd/roller_coaster_games_2020_theme_park_mod_apk.pdfIn PDF document text
    • http://vas-rem.ru/groth_lecture_notes_in_macroeconomics80wfs.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/gupawupigawono/vevugorotuvuxupebudide.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/fepekofixemexasu.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_off0000ff51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF51 5396 bytes
SHA-256: 6b5a6541165dc81ecead5c8e85bf14deebc597c3f3f26aa25a04e86a8e6df07f
font_01_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 11220 bytes
SHA-256: 860969d7ac8f3a8d5611d9da4b30f109f1db2c7a21dd50e7857679bed0d2dbb2

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