Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ace452629cf8b1…

MALICIOUS

PDF

99.8 KB Created: 2021-02-25 06:09:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ae4633ac01d3d8064d60324594f82be4 SHA-1: 17d5f97502047867d3d87c9bd43c0f55763f716d SHA-256: d3ace452629cf8b117f8e686d9d30eba28f47eb3c2871fc1a8c65244d649cc65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a 'free consultation' related to employment law, suggesting a phishing or scam lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing campaigns that often leverage JavaScript for obfuscation or redirection.

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://leonvi.ru/award?keyword=employment+contract+lawyer+free+consultation PDF link annotation
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/lasezewezinobixaj.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/how_long_for_baby_to_get_in_deep_sleep.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/voyager_legend_cs_replacement_headset.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/2VibBqd/maze_the_king_eternal_monarch_lyrics.pdfIn PDF document text
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/zezufozu.pdfIn PDF document text
    • https://laxumobunutag.weebly.com/uploads/1/3/4/0/134017566/sopimo.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/fraction_decimal_percent_table_worksheet.pdfIn PDF document text
    • https://xadixifiv.weebly.com/uploads/1/3/4/8/134888816/719843.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/guest_services_supervisor_job_description.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kudufigunabi/cg_movies_2018_free.pdfIn PDF document text
    • http://wepexivir.epizy.com/lomokuxek.pdfIn PDF document text
    • http://gavojomizam.epizy.com/godapagoneladekugobaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/student_desmos_central_park_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 5192 bytes
SHA-256: 450110a0d5d6f78be8d87a94cc347cb01a2be38da55a883bc4c443bc5df97c97
font_01_sfnt_off00014ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBE 10872 bytes
SHA-256: 4c0896d48bd53967e6f6ad6b9e6c06844cd7672a292b7112b5ba985e3d991ae1
font_02_sfnt_off000173ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173AD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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