Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c6b8b2821545ec…

MALICIOUS

PDF

89.8 KB Created: 2021-05-22 02:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 97d76d986296cf454ff3d7e3f123a4f1 SHA-1: 9045165f6a78d763f8ebbb1e6eac1d0734a3ff69 SHA-256: 48c6b8b2821545ec37ad2219e2ce1de32d07a6c9ac6e106f21a2171001d53dd0
214 Risk Score

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/strik?utm_term=formula+quimica+del+acido+selenico In PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_600b338dd1e38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465556/normal_5fcb9caa325fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452612/normal_6046664f5c3c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461786/normal_5fff03419139e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fe0e7bd486b6.pdfIn PDF document text
    • https://pavibizad.weebly.com/uploads/1/3/0/7/130740264/9113178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_604d2abb31ba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fc67d3992c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418197/normal_60200b8014edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421058/normal_6020b5e2b433c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_604ca34a84381.pdfIn PDF document text
    • https://vujirazezada.weebly.com/uploads/1/3/2/6/132681664/tumin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5fc8876a1ce76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_600901e9eb873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_6007a0de310f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_602d75ef97840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476421/normal_601fab14dc7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_60534ef6ba5c0.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/283156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402280/normal_605603028ce06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_5fea3bae1a030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_601bec157ee88.pdfIn PDF document text
    • https://wukodaxumubef.weebly.com/uploads/1/3/4/4/134438005/setiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_602f0cfa16469.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
    • 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 4968 bytes
SHA-256: 7d2ddcad2600e04a9bd5e13e8dec566f6166cbb453e45aef065fbd6c080c83b4
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 14628 bytes
SHA-256: 2a2bc132f2c678780ac6c36d8c08cc678fcf43499d39a1655fa32b0897e2d1de
font_02_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 16260 bytes
SHA-256: d25a34a56be33791b66bd7dbe91ee772b39b89bee75ba0e64ef3ea6cb2c10b57
font_03_sfnt_off00014944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14944 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2