Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e5e56b877dc319…

MALICIOUS

PDF

85.9 KB Created: 2021-03-17 03:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e154b878e2bdc8c785af0a2774616251 SHA-1: 976d66e8407779abf02e747c4a4abda23877fca5 SHA-256: 41e5e56b877dc319934b5a9445b7fc2d4b75312aab583bd3545fae8c653ab4e1
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits multiple critical heuristic firings, including a ML classifier flagging it as malicious and ClamAV detecting it as Pdf.Phishing.Trojan. The presence of a 'Recovery secret / private key request' lure, combined with numerous external links to potentially malicious PDFs and a link farm, strongly suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and external links indicate it is designed to exploit users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://xezojetit.ru/wix?keyword=apkpure+showbox+firestick PDF link annotation
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/56826c7.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/chamberlain_universal_remote_genie_intellicode.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/7690287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496584/normal_6028ed81f1bfb.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/8687790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451228/normal_6022ccc8401b8.pdfIn PDF document text
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/84b2b5a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_602eacb8a9a46.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/aa67b5da.pdfIn PDF document text
    • http://ziximotizaned.medianewsonline.com/catalogo_inglesina_2020.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/tovikulok_jusunulatuzof_ledij_tajivelizepi.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/tapexiw/59785991920.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/kindle_y_formato_epub.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/mopuxoretoriz.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/32462307715.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_431d392a1df44424942a206e741a7f11.pdf?index=trueIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_8e6ee7d0d9f04d52b846f63061e67f5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/police_application_form_competency_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/39559255905.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_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 5216 bytes
SHA-256: 0ce0775e363dcf241f69d592d1c685cd5e607da92a80d5af553b33742bfbafa0
font_01_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 11488 bytes
SHA-256: 61fb02454e65b746ed2991db82b1bb4e5d9f107b6b0137aedc1e0aa930222926

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