Malicious PDF — malware analysis report

Static analysis result for SHA-256 df47ad499ea33e70…

MALICIOUS

PDF

86.3 KB Created: 2021-03-07 01:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 515fc463108fcd943f8bd59a04569f6b SHA-1: 3dd30fbc71115aab20ff39419973eadfc2749b48 SHA-256: df47ad499ea33e701cf2f46ed96cb033d9fd8eebe60693749f7744522203d7de
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links point towards a social engineering attack to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=ti+nspire+cas+software+mac PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421939/normal_60256f184ac82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_6026a5886bb81.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/fd30e20b56e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_6031c6cb43b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401545/normal_5fdbc44dee242.pdfIn PDF document text
    • https://mezamelakinates.weebly.com/uploads/1/3/5/3/135304028/womabovez-xufad-filajadoxep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379837/normal_602c460093b48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463005/normal_5fef4b133c556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fe8ac5235ee3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390382/normal_5fc6271fed86b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377379/normal_5ff0d249b2657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366302/normal_5fddd096b8b11.pdfIn PDF document text
    • https://nutipofuvi.weebly.com/uploads/1/3/5/3/135310868/8269519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_417efd9a3d5849ffb9cd4fa9f86baa23.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_8879c2fc9420419aa5d6912c809c7d80.pdf?index=trueIn PDF document text
    • https://78bdfa25-736e-4945-a764-db21511aacb9.filesusr.com/ugd/9bd82e_02c23067431041a5aa785a17efd3d8c5.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_491c6b0cbc954759aded798f4dfcb89f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/642933d2-bcce-4da6-9d18-0bb64aa52cf7/itchy_burning_pimples_on_scalp.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_d0e0416acbac4b3ca87ea1b9ccc56e8d.pdf?index=trueIn PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_b7e4a600210e40c39085790ec67e07d8.pdf?index=trueIn PDF document text
    • https://ff366fda-cde0-4b3b-b256-8a43afed25ec.filesusr.com/ugd/b3318b_c5fd93872e404928876116496d0cd784.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0ed1e2-8807-4bae-909c-1b799fac120f/97891144384.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_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 5172 bytes
SHA-256: 29bde375ef2775b20e931129afcf6648de1a87e4ecba10da340db79716a3d66e
font_01_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 11984 bytes
SHA-256: 61098e9c83b42d934e64ceec09c177ab2abb4b1db782393d886e7d2cd2265309