Malicious PDF — malware analysis report

Static analysis result for SHA-256 19b2c5f7420241c9…

MALICIOUS

PDF

105.3 KB Created: 2020-11-26 01:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f155938e0f339aaaf9471f4ba568de59 SHA-1: bcf2711ee4ae3fe30cd644e2f7bdf8727e5c4ae6 SHA-256: 19b2c5f7420241c9b0e9b6f3cd5b40512e7dac1843762859cebf136ba3b51bfc
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, indicating a phishing or redirection attempt. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=thin+ice+club+penguin+rewritten In PDF document text
    • https://munizifazu.weebly.com/uploads/1/3/4/3/134354015/3358220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467571/normal_5fb48c329c838.pdfIn PDF document text
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/7766d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5f9fa0a109f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_5f950c618dff7.pdfIn PDF document text
    • https://zarenatufozif.weebly.com/uploads/1/3/4/6/134691537/41e12.pdfIn PDF document text
    • https://rapexukiwivusa.weebly.com/uploads/1/3/4/8/134856806/d9c9535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f8d7d348845d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f8b6f116f952.pdfIn PDF document text
    • https://towimoni.weebly.com/uploads/1/3/4/3/134340956/nalexas-ditubidimufe-pizugit-wigizofukulovu.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/biwerop.pdfIn PDF document text
    • https://tanutefezuje.weebly.com/uploads/1/3/4/4/134437554/sevijikidop-kujofuvor-livikadif-limiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fodose/apush_out_of_many_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/understanding_psychology_mcgraw_hill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54035d17-d2eb-4d23-a6d8-9cc5d2326740/mexusagojelanamerejap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a4895e-cb26-415d-957e-0c951f90b088/bezpenost_krje_potravin.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 6588 bytes
SHA-256: 4e1a9c4cb32f1bc4ff176ae4dc1460c31b2d267bf2def0252f23ad2731e7be72
font_01_sfnt_off000136df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DF 4988 bytes
SHA-256: 76107e8101aaff6152931234c34348d758f1843d3f85fb88c0a3861d3fecb80a
font_02_sfnt_off000147db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DB 3572 bytes
SHA-256: 4b43113ac4d3666a8e19c6ff3937d7c6af16920b0fbab0459d6eb9b7e6cb592d
font_03_sfnt_off000155e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E6 13548 bytes
SHA-256: be2b6dfad6fef3bd60170ee7b73876d88fc32c5ff799518614b170473183be5f
font_04_sfnt_off00018197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18197 16172 bytes
SHA-256: 0a3179cfdbe9401304e3c26a2804e16bedc61546765a8133fdea52b189e76066

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