Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6985a073fdb5a7…

MALICIOUS

PDF

75.7 KB Created: 2021-06-03 11:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 35c93f4391a2f0a1188d25f3285d508a SHA-1: e71103321b7366da95e544657a309ccae749e1f0 SHA-256: 5c6985a073fdb5a72d498b6f89a935c5d639947bb12b9218e37cd9f2155968ac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://oniceh.ru/pbw?utm_term=nfs+most+wanted+2005+highly+compressed+100mb+for+pc+download PDF link annotation
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/wisuraxe.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/nobudilipuwe.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/kuvezo-noxev.pdfIn PDF document text
    • https://sufafiderek.weebly.com/uploads/1/3/0/8/130814754/5281742.pdfIn PDF document text
    • https://botasapozav.weebly.com/uploads/1/3/1/6/131607984/6283572.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/2255742.pdfIn PDF document text
    • https://jonolepazom.weebly.com/uploads/1/3/4/5/134520471/3483689.pdfIn PDF document text
    • https://lenukadizavubo.weebly.com/uploads/1/3/4/4/134492519/6472949.pdfIn PDF document text
    • https://tesitibu.weebly.com/uploads/1/3/4/7/134712385/sasexezo.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/8427399d-3fac-4767-bfb9-fb650594f272/30945939321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fd921f-172f-4539-8fae-2d4033a27c21/69205358604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d80c58-4f99-47d1-b4c9-a038dc0e671e/veguwagupabiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96624d92-d5e2-4422-8eaa-d234613e3c39/59662915206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/146572a5-4005-409c-aca6-4572339aa263/platos_dialogues_atlantis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5569baa7-cd07-42d1-b988-70abec3e4ba9/gisititedilolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4346d96-bd58-4f80-bfd4-c975c6e7b0ff/rizexi.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/93284252722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717a08d2-98a6-4c44-afb3-9e88ebd19eaa/24288621852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e024f1d6-b297-46dc-8950-63b3ab17663f/jinifereseju.pdfIn PDF document text
    • http://zewalar.pbworks.com/f/ejercicios_de_suma_resta_multiplicacion_y_division_para_4_grado.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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 6324 bytes
SHA-256: 7dc1cc76d8ae619356e3878201ace7952e23e4f08dec010cea774afda4f7cd12
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 11260 bytes
SHA-256: 5f32d4a2ddec80ed71ca9eb8b0f1ae1e07d24c5d412e2dccfa1da1a087e7a961

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