Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14222a69708d06e…

MALICIOUS

PDF

72.8 KB Created: 2021-04-04 02:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7a351f7dce2f28ff338eca2a5c155888 SHA-1: b20dc7a6ee40d3131e245e2f419b4637d7b2aa2e SHA-256: b14222a69708d06e1b4752f5611991588af6945c26d84d47f408bbcdb8b0a25b
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-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://dugedepap.ru/award?keyword=dicion%25C3%25A1rio+jur%25C3%25ADdico+da+academia+brasileira+de+letras+jur%25C3%25ADdicas+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453902/normal_6031f2b64d9f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_605d6e3429907.pdfIn PDF document text
    • http://romakipojaxu.mygamesonline.org/base64_to_reactjs.pdfIn PDF document text
    • https://zomubotedop.weebly.com/uploads/1/3/0/8/130873922/namufijeladu_genilofefotepu_wonubosoba_biwoz.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/46823547436.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/9f0baca8644a833.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabovabavuwemet.rf.gd/exploring_kotlin_functional_programming.pdfIn PDF document text
    • http://fewajun.epizy.com/naming_acids_worksheet_grade_10.pdfIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_f7c4f6e4e9a5471181503bb0f8c4cb33.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19653fe6-0976-43ca-84f5-af47abf45865/samsung_xpress_c460w_printer_driver_download.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/jerid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5a0de9e-a4e5-4e79-8fb3-0a1b85834a31/brother_serger_1034d_parts.pdfIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_f95f6c9470de403a81787d38982f376e.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_c719b3e4b48d4301b438b22ab31a8771.pdf?index=trueIn PDF document text
    • http://jubogaju.atwebpages.com/zipovosisa.pdfIn PDF document text
    • http://ratimoli.epizy.com/14925790471.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_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 5804 bytes
SHA-256: 10ad3fec602129c78b0946429460620037da5c53c627e0d64660bb5e0bdc3399
font_01_sfnt_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 13528 bytes
SHA-256: 0e589384eb182ff5093e374163db3adb75f7051a71e3113a6347c204c355ed16

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