Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac30522f7d55006d…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 15:05:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 32f8e1db5356db43b3307e0f78505b54 SHA-1: 46aa37232f9075645e537839cc086a028ae8475f SHA-256: ac30522f7d55006d4a27b08f1a946df1f3d60a04f45c4023e56663efffead224
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=xbox+360+guitar+hero+controller+work+on+xbox+one PDF link annotation
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/406ea1a9.pdfIn PDF document text
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/gelopagifixar-kilimasi.pdfIn PDF document text
    • http://magnetfix.store/lesisetowifezihfjwk.pdfIn PDF document text
    • http://myfoxing.online/pokemon_light_platinum_walkthrough_lauren_guidekd9p2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_6033c0d621e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_6058e29f2448f.pdfIn PDF document text
    • http://epipog.com/47439025802c2oji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_2554c53c03c24c5589ceae42d0a89354.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cadac6d-d5e2-4985-bd9b-ae48ffe5f63c/troy_bilt_2410_starter.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_c5caa56933134b648d0b9dcea0669ff5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb46c7b-904c-45c3-b8f4-a0cfb78c107d/51770765188.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_48c02d5a21584147be082a3a8dea853f.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_3e44e7080a9d4c96a97fa4a6af8a47ef.pdf?index=trueIn PDF document text
    • https://78de399b-5cb1-4d05-8290-e7933402b20f.filesusr.com/ugd/10f998_240873ee972c4113a74dee39c74faa4c.pdf?index=trueIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_d9f9a8096a724eec964b0193c7ec0ce4.pdf?index=trueIn PDF document text
    • https://27158da8-170d-48ca-a528-b8ced62fe517.filesusr.com/ugd/9fc8c3_da625f41937f459498cc5408b8e56bc1.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_261c832caa81497cbb8d9a2eb760a7a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a86f7d-61b2-474b-b857-a1fc4a029f59/nigedazixux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c7cc42-c6e0-46d4-a59d-116ce270c37f/international_journal_of_pharmaceutical_sciences_and_drug_research_abbreviation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727a2a5c-c038-40de-a6f3-d11e9d47fcae/sub_zero_642_ice_maker_not_working.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_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 5684 bytes
SHA-256: 970c0105ccdef80b7fb25cd3a78000562ea4e31e22e708ae57736a3b70847f0c
font_01_sfnt_off0000ffe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE6 10700 bytes
SHA-256: 366705d7b345c67641d3a824a2c11642ff150797cbb1735fb48d80019037efe1