Malicious PDF — malware analysis report

Static analysis result for SHA-256 49624483e518b24d…

MALICIOUS

PDF

78.1 KB Created: 2021-03-22 13:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 439eece5d60b653b5a8bf4865326bb8e SHA-1: 6d1c1ced66c6e44bc222a00cdc56f84a0c95ae9f SHA-256: 49624483e518b24dfa3791fe2829d291dd4db76ef74acfbf42c2996872d53e88
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous links, including one pointing to 'disclosures.space', suggests a link farm or redirection mechanism to facilitate malicious activities. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/award?keyword=berlin+attractions+map+pdf PDF link annotation
    • http://disclosures.space/tudiripekimovewevojilozmi30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd5f04cdf084.pdfIn PDF document text
    • https://fibupodofakakov.weebly.com/uploads/1/3/4/4/134496100/31768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485576/normal_6008f3235e067.pdfIn PDF document text
    • http://birebap.scienceontheweb.net/buenos_dias_mi_princesa_bella_te_amo.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/197ea6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_60031a5e5219f.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/zetosonazofalaforajug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_600de9aeb77a0.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/1996073.pdfIn PDF document text
    • http://strgb2.ru/72403780735ecenh.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/13338631732ykzii.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401972/normal_6054378fe14c0.pdfIn PDF document text
    • http://prizinsta365.website/lamborghini_papercraft_pdoqnvqp.pdfIn PDF document text
    • http://hookup157.site/20880327350nkbxv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a9d57b-194c-4c59-9c20-be9c2a2c8c7e/67940833007.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/box_tops_for_education_halloween_collection_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f2c81a-2db0-4cac-a6d3-836668efd96a/free_tableau_tutorial_for_beginners_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b54531-3380-4c80-aa3e-3512f8a21b17/king_james_bible_verses_about_faith_and_strength.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/70901046195.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83151c4-e211-4aa0-992d-142ea7422c36/bible_verses_when_you_feel_lonely.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/como_limpiar_los_zapatos_de_cuero_por_dentro.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/gakirokenesazegopaziw.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/what_do_u_mean_by_a_quick_study.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 5348 bytes
SHA-256: 868a61499ce66b1954bb4c59e0bb37263251568f2c2888941572e64afb2a0c0e
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 11704 bytes
SHA-256: 96f6cab8d299460b3e3ab77b3ad9ebb5ef5103b50f2aadcd4e05b3b86878607e

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