Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e87f7a58fd6f23…

MALICIOUS

PDF

80.5 KB Created: 2021-04-11 06:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 41e04e9b883161efdf8ea68ccf407fd1 SHA-1: 06cae65bfda2dde757563e58343a9e7a2c09bd94 SHA-256: 52e87f7a58fd6f23cd1ce12c071d6d3eb1835480f4299669b33d17475a1a0eb1
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a potential phishing lure pointing to 'https://kuzutuzo.ru/strik?utm_term=lane+recliner+user+manual'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=lane+recliner+user+manual PDF link annotation
    • http://kujazutowisut.22web.org/how_to_add_fractions_with_like_denominators_and_whole_numbers.pdfIn PDF document text
    • http://kevekozulanilim.sportsontheweb.net/amazon_echo_2nd_generation_user_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60206fcdc81cc.pdfIn PDF document text
    • http://bapitosegapegi.mywebcommunity.org/phonics_practice_grade_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_603a1f6b543c4.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/instrumen_akreditasi_puskesmas_pendampingan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_6056c4394550f.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/angel_fish_care.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/17654343204.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/xisopoxemotoreteturesi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_746789b2aa6e40909a3af17ccb9143c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0a79cf-7307-46f3-bc52-69a6f268ad1a/2004_honda_civic_lx_maintenance_required_light.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/enemy_pie_read_aloud.pdfIn PDF document text
    • http://mofikasim.epizy.com/17256370755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3c2841-b6f3-429b-b09c-0966a125b9f8/3597657534.pdfIn PDF document text
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_fd61876880a1476bb5ce33f4d697c04b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75b3abff-b715-444d-bca3-f7bb87a3680d/apush_review_packet_answers.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/dewalt_miter_saw_12_inch_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d636c08-8165-4c4f-9d4b-9a6092f0464e/92046989698.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_382f7f29707340ac922e0bb1aea779c6.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_2d7aea61205d4270b288d78132fe5faa.pdf?index=trueIn PDF document text
    • http://susabumo.atwebpages.com/47280857440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095c7498-b4d9-4150-8b75-a13d4cf80305/lightning_thief_musical_cast_recording.pdfIn PDF document text
    • http://sesunofopum.epizy.com/titom.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_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 4888 bytes
SHA-256: d3eae0e01f088592f40e9ad726c3dfb48166f4ad4d4055cc46f0ac668831e1c6
font_01_sfnt_off00010b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B37 12012 bytes
SHA-256: b511b994acd2fec04b12fecf7c86485fbde95ef5214c1cd824a95dadb6ed81cf