Malicious PDF — malware analysis report

Static analysis result for SHA-256 36232757e9a79608…

MALICIOUS

PDF

80.9 KB Created: 2021-04-01 04:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4ede48c123c5a809fb1429ad41130e78 SHA-1: 1761774cfddec41c9f87c5b8f4411688dc2fb841 SHA-256: 36232757e9a796089dd60e6b675609756694725b990ac5dae5687e586b04a5c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of many external URIs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/award?keyword=calentador+solar+casero+con+botellas+de+plastico+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458621/normal_604cd192e55b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fceba0494ddf.pdfIn PDF document text
    • http://1xbet-football.fun/myanmar_wikipedia_apk_downloada4ht7.pdfIn PDF document text
    • http://poradoit1.site/fogomobes0b4k0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_603032fc99959.pdfIn PDF document text
    • http://oneplusonemain.xyz/kaiser_permanente_near_me1q5as.pdfIn PDF document text
    • http://creditscorecard.info/5187226589528qqr.pdfIn PDF document text
    • http://helper-badges.com/marolidifivj0jvl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_603a415f6557c.pdfIn PDF document text
    • http://cardioactiveuficiale.site/ocarina_of_time_master_quest_forest_temple_keyssacn1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ffac55978ab7.pdfIn PDF document text
    • http://shop-profildoors.ru/financial_analyst_interview_questions_and_answers_for_fresherslzvui.pdfIn PDF document text
    • http://1pokypki.website/jiladifivelofufavx3w1.pdfIn PDF document text
    • http://perevozka.ru/dakugudiwoxukoripomorik7xu1r.pdfIn PDF document text
    • http://ketotreno.buzz/77679596843qp40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3e021c9a-284a-4c54-9ba1-f6d43d4d2ba5.filesusr.com/ugd/a619af_a335a635157946db9a406bbb28bef4c0.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_227dae3e1884431b970e3eda3ca59c93.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_5567452da9954faca7f4ff7deb7a90be.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_65fe23758d0c4694a0f4afe247c6b927.pdf?index=trueIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_fa796e0305a147daa2c6b6be3eac989b.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5196 bytes
SHA-256: 28f0cca46974cacba19b3decda6f9c6088174eec4b61a75869293da77b40edca
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 11044 bytes
SHA-256: b268609c9d717985dbecdc8a2cd55519adf6fffe7ce0aea758581e914ba747d5
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0

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