Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b5fa2eb46c1e2b…

MALICIOUS

PDF

80.1 KB Created: 2021-03-09 10:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 864628c7b6d8647b2962cac4d94f06f3 SHA-1: c37e925104087b761a0a5f68f9aaaba2a07933a0 SHA-256: 83b5fa2eb46c1e2beee060af751486dbfc0720456a8da499a62d207083a1902d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=impulse+control+techniques+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421462/normal_5fed2dbc23b5f.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/akUfjcO/ziduxujurufubunajosud.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/59873057416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_6046f90c7309d.pdfIn PDF document text
    • https://cdn.sqhk.co/gitesafuwu/gjbhcji/developing_management_skills_3rd_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_60290cda5252d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_602093a193605.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/4059954819.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/tinuxuzazevupexutulapader.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gihcm7N/antivirus_free_2021_virus_cleaner_2019.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/learn_english_speaking_for_beginners_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/vAgchdm/last_human_life_on_earth_mod_apk_an1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dafawesag.epizy.com/responsive_css_media_queries_template.pdfIn PDF document text
    • http://jamotawopoxagu.rf.gd/vogokipukikut.pdfIn PDF document text
    • http://vopawebelugodub.rf.gd/a_midsummer_nights_dream_script_with_line_numbers.pdfIn PDF document text
    • http://mujozigimak.rf.gd/29574118566.pdfIn PDF document text
    • http://vosivoru.epizy.com/wujonekevekomipij.pdfIn PDF document text
    • http://pifazudiso.rf.gd/communist_manifesto_half_price_books.pdfIn PDF document text
    • http://pivunovukemo.epizy.com/kaxegarel.pdfIn PDF document text
    • http://vipowiso.epizy.com/jizorojefazowagaworekofi.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/mofinatugapidufenudadele.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/anthropological_theory_today.pdfIn PDF document text
    • http://setekavapitefe.rf.gd/hdfc_life_progrowth_plus_fund_performance.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_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 5248 bytes
SHA-256: 3f917815122654dde007a3e265c6beac8a3b65b0f84ffc85002e9aa475a70c03
font_01_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 10276 bytes
SHA-256: 225733d78133bf86da68ff1ad19ada8b286b7d22d0b21243b682546d8b11854f

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