Malicious PDF — malware analysis report

Static analysis result for SHA-256 a432545b20e0ae5c…

MALICIOUS

PDF

71.0 KB Created: 2021-04-01 02:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c6bc3aaf1872a43a16ea76a688f7e86b SHA-1: df3ec62c93607e9b5990b35f058ae34c2d44084e SHA-256: a432545b20e0ae5c82f145170405e72f09826c995c37f3d93093b95f32aa4eab
166 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. It uses a password-protected-archive lure. 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://botokaw.ru/strik?utm_term=chapter+2+chemistry+of+living+things+answer+key PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/91ifZHj/free_pet_sitter_instructions_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377697/normal_5ff48c98724f3.pdfIn PDF document text
    • https://cdn.sqhk.co/tumokufagu/jiDhaif/marble_solitaire_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/eyfiabd/pirokoj.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/iiasigc/biluvifali.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/iRhijgP/76633430570.pdfIn PDF document text
    • http://pexawegowe.mywebcommunity.org/6197781644.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/schlage_touch_satin_nickel_camelot_entry_door_lever.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_5fd11632c990f.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/V1NsW9a/winil.pdfIn PDF document text
    • http://riniwodifole.medianewsonline.com/kindle_touch_model_d01200_specs.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/rofimolug.pdfIn PDF document text
    • http://madokedaxemosu.22web.org/vuwezedok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_6014ac64daf35.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/bionanoscience_guidelines_for_author.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_6028051fe99a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454436/normal_604f5f852e8ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwimusef.epizy.com/how_to_use_the_bissell_spot_clean_proheat.pdfIn PDF document text
    • http://tarafawemuvib.epizy.com/student_registration_form_in_html_with_css_codepen.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/mans_higher_consciousness_hilton_hotema.pdfIn PDF document text
    • http://redifigikutusoj.myartsonline.com/53716927648.pdfIn PDF document text
    • http://zeroxezubanalil.onlinewebshop.net/algebra_high_school_textbook.pdfIn PDF document text
    • http://budokukikaririd.rf.gd/47373195713.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 5784 bytes
SHA-256: c669fa0da39590c28faf4d35141a1097bb7032f82ce660b56bd61cd161278253
font_01_sfnt_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 10572 bytes
SHA-256: 7788cc0984016cb7213c1af11e46cdf2f13e69943b2378090bec594b711f286d

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